| Titulo | Fecha | Proveedor | Acceso | Cambio de titulo |
| Open Family Studies Journal | 2008-2020 | Bentham open | Gratis | . |
| Open Fish Science Journal | 2008-2019 | Bentham open | Gratis | . |
| Open Food Science Journal | 2007-2015 | Bentham open | Gratis | . |
| Open Forensic Science Journal | 2008-2014 | Bentham open | Gratis | . |
| Open Forest Science Journal | 2008-2014 | Bentham open | Gratis | . |
| Open Forum Infectious Diseases | 2014- | Oxford Academic | Gratis | . |
| Open Forum Infectious Diseases | 2014- | PubMed Central | Gratis | . |
| Open Forum Infectious Diseases | 2014- | Ebsco Academic | . | . |
| Open Forum Infectious Diseases | 2014- | Ovid Technologies, Inc. | . | . |
| Open Forum Infectious Diseases | 2014- excepto últimos 12 meses | ProQuest Information and Learning | . | . |
| Open Fuel Cells Journal | 2008-2013 | Bentham open | Gratis | . |
| Open Fuels & Energy Science Journal | 2008-2018 | Bentham open | Gratis | . |
| Open Gastroenterology Journal | 2007-2013 | Bentham open | Gratis | . |
| Open Gender Journal | 2017- | FU Berlin | Gratis | . |
| Open Gene Therapy Journal | 2008-2013 | Bentham open | Gratis | . |
| Open General & Internal Medicine Journal | 2007-2014 | Bentham open | Gratis | . |
| Open Genomics Journal | 2008-2013 | Bentham open | Gratis | . |
| Open Geography Journal | 2010-2015 | Bentham open | Gratis | . |
| Open Geology Journal | 2007-2015 | Bentham open | Gratis | . |
| Open Geomechanics | 2019- | Centre Mersenne | Gratis | . |
| Open Geosciences | 2015- | de Gruyter | Gratis | Cambio de: Central European Journal of Geosciences |
| Open Geosciences | 2009- | ProQuest Information and Learning | . | Cambio de: Central European Journal of Geosciences |
| Open Geospatial Data Software and Standards | 2015-2020 | SpringerOpen | Gratis | . |
| Open Geospatial Data Software and Standards | 2020-2020 | ProQuest Information and Learning | . | . |
| Open Geospatial Data Software and Standards | 2016-2020 | Springer | . | . |
| Open Geriatric Medicine Journal | 2008-2014 | Bentham open | Gratis | . |
| Open Glycoscience | 2008-2012 | Bentham open | Gratis | . |
| Open Government A Journal on Freedom of Information | 2005-2010 | Wayback Machine | Gratis | . |
| Open Health | 2020- | de Gruyter | Gratis | . |
| Open Health Data | 2013- | Ubiquity Press | Gratis | . |
| Open Health Data | 2018-2022 | Ebsco Academic | . | . |
| Open Health Services and Policy Journal | 2008-2011 | Bentham open | Gratis | . |
| Open Heart | 2013- | BMJ Publishing Group | Gratis | . |
| Open Heart | 2014- | PubMed Central | Gratis | . |
| Open Heart | 2014- | ProQuest Information and Learning | . | . |
| Open Heart Failure Journal | 2008-2010 | Bentham open | Gratis | . |
| Open Hematology Journal | 2007-2012 | Bentham open | Gratis | . |
| Open Hepatology Journal | 2009-2011 | Bentham open | Gratis | . |
| Open Horticulture Journal | 2008-2014 | Bentham open | Gratis | . |
| Open House International | 2009- | ProQuest Information and Learning | . | . |
| Open Hydrology Journal | 2007-2015 | Bentham open | Gratis | . |
| Open Hypertension Journal | 2008-2020 | Bentham open | Gratis | . |
| Open Immunology Journal | 2008-2020 | Bentham open | Gratis | . |
| Open Industrial & Manufacturing Engineering Journal | 2008-2012 | Bentham open | Gratis | . |
| Open Infectious Diseases Journal | 2007- | Bentham open | Gratis | . |
| Open Inflammation Journal | 2008-2014 | Bentham open | Gratis | . |
| Open Information Science | 2017- | de Gruyter | Gratis | . |
| Open Information Science | 2022- | Ebsco Academic | . | . |
| Open Information Science Journal | 2008-2011 | Bentham open | Gratis | . |
| Open Information Systems Journal | 2007-2013 | Bentham open | Gratis | . |
| Open Inorganic Chemistry Journal | 2007-2009 | Bentham open | Gratis | . |
| Open International Journal of Informatics | 2012- | Universiti Teknologi Malaysia | Gratis | . |
| Open Journal for Anthropological Studies | 2018- | Center for Open Access in Science, Belgrade, Serbia | Gratis | . |
| Open Journal for Educational Research | 2017- | Center for Open Access in Science, Belgrade, Serbia | Gratis | . |
| Open Journal for Information Technology | 2018- | Center for Open Access in Science, Belgrade, Serbia | Gratis | . |
| Open Journal for Legal Studies | 2018- | Center for Open Access in Science, Belgrade, Serbia | Gratis | . |
| Open Journal for Psychological Research | 2018- | Center for Open Access in Science, Belgrade, Serbia | Gratis | . |
| Open Journal for Research in Economics | 2018- | Center for Open Access in Science, Belgrade, Serbia | Gratis | . |
| Open Journal for Sociological Studies | 2017- | Center for Open Access in Science, Belgrade, Serbia | Gratis | . |
| Open Journal for Studies in Arts | 2018- | Center for Open Access in Science, Belgrade, Serbia | Gratis | . |
| Open Journal for Studies in History | 2018- | Center for Open Access in Science, Belgrade, Serbia | Gratis | . |
| Open Journal for Studies in Linguistics | 2018- | Center for Open Access in Science, Belgrade, Serbia | Gratis | . |
| Open Journal for Studies in Philosophy | 2018- | Center for Open Access in Science, Belgrade, Serbia | Gratis | . |
| Open Journal of Accounting | 2012- | Scientific Research Publishing | Gratis | . |
| Open Journal of Acoustics | 2011- | Scientific Research Publishing | Gratis | . |
| Open Journal of Air Pollution | 2012- | Scientific Research Publishing | Gratis | . |
| Open Journal of Anesthesiology | 2011- | Scientific Research Publishing | Gratis | . |
| Open Journal of Animal Sciences | 2011- | Scientific Research Publishing | Gratis | . |
| Open Journal of Apoptosis | 2012- | Scientific Research Publishing | Gratis | . |
| Open Journal of Applied Biosensor | 2012- | Scientific Research Publishing | Gratis | . |
| Open Journal of Applied Sciences | 2011- | Scientific Research Publishing | Gratis | . |
| Open journal of archaeometry | 2011-2018 | PAGEPress | Gratis | . |
| Open Journal of Big Data | 2015- | RonPub | Gratis | . |
| Open Journal of Biophysics | 2011- | Scientific Research Publishing | Gratis | . |
| Open Journal of Bioresources | 2014- | Ubiquity Press | Gratis | . |
| Open Journal of Bioresources | 2017- | Ebsco Academic | . | . |
| Open Journal of Blood Diseases | 2011- | Scientific Research Publishing | Gratis | . |
| Open Journal of Cardiovascular Surgery | 2010- | Sage Journals | Gratis | . |
| Open Journal of Cardiovascular Surgery | 2011-2019 | PubMed Central | Gratis | . |
| Open Journal of Cardiovascular Surgery | 2008-2018 | ProQuest Information and Learning | . | . |
| Open Journal of Cell Biology | 2011- | Scientific Research Publishing | Gratis | . |
| Open Journal of Civil Engineering | 2011- | Scientific Research Publishing | Gratis | . |
| Open Journal of Clinical Diagnostics | 2011- | Scientific Research Publishing | Gratis | . |
| Open Journal of Composite Materials | 2011- | Scientific Research Publishing | Gratis | . |
| Open Journal of Depression | 2012- | Scientific Research Publishing | Gratis | . |
| Open Journal of Discrete Mathematics | 2011´- | Scientific Research Publishing | Gratis | . |
| Open Journal of Earthquake Research | 2012- | Scientific Research Publishing | Gratis | . |
| Open Journal of Ecology | 2011- | Scientific Research Publishing | Gratis | . |
| Open Journal of Endocrine and Metabolic Diseases | 2011- | Scientific Research Journal Ltd. | Gratis | . |
| Open Journal of Energy Efficiency | 2012- | Scientific Research Publishing | Gratis | . |
| Open Journal of Epidemiology | 2011- | Scientific Research Publishing | Gratis | . |
| Open Journal of Fluid Dynamics | 2011- | Scientific Research Publishing | Gratis | . |
| Open Journal of Forestry | 2011- | Scientific Research Publishing | Gratis | . |
| Open Journal of Gastroenterology | 2011- | Scientific Research Publishing | Gratis | . |
| Open Journal of Genetics | 2011- | Scientific Research Publishing | Gratis | . |
| Open Journal of Geology | 2011- | Scientific Research Publishing | Gratis | . |
| Open Journal of Hematology | 2010-2017 | Wayback Machine | Gratis | . |
| Open Journal of Humanities | 2019- | Universitas Studiorum | Gratis | . |
| Open Journal of Immunology | 2011- | Scientific Research Publishing | Gratis | . |
| Open Journal of Implant Dentistry | 2013-2014 | AOSIS OpenJournals | Gratis | . |
| Open Journal of Implant Dentistry | 2013- | Sabinet | Gratis | . |
| Open Journal of Inorganic Chemistry | 2011- | Scientific Research Publishing | Gratis | . |
| Open Journal of Inorganic Non-metallic Materials | 2011- | Scientific Research Publishing | Gratis | . |
| Open Journal of Internal Medicine | 2011- | Scientific Research Publishing | Gratis | . |
| Open Journal of Internet of Things | 2015- | RonPub | Gratis | . |
| Open Journal of Knowledge Management | 2010- | Community of Knowledge | Gratis | . |
| Open Journal of Knowledge Management | 2011-2013 | Ebsco Academic | . | . |
| Open Journal of Leadership | 2012- | Scientific Research Publishing | Gratis | . |
| Open Journal of Marine Science | 2011- | Scientific Research Publishing | Gratis | . |
| Open Journal of Mathematical Analysis | 2017- | Ptolemy Scientific Research Press | Gratis | . |
| Open Journal of Mathematical Optimization | 2020- | Centre Mersenne | Gratis | . |
| Open Journal of Mathematical Optimization | 2020- | Numdam | Gratis | . |
| Open Journal of Mathematical Sciences | 2017- | National Mathematical Society of Pakistan | Gratis | . |
| Open Journal of Medical Imaging | 2011- | Scientific Research Publishing | Gratis | . |
| Open Journal of Medical Microbiology | 2011- | Scientific Research Publishing | Gratis | . |
| Open Journal of Medical Psychology | 2012- | Scientific Research Publishing | Gratis | . |
| Open Journal of Medicinal Chemistry | 2011- | Scientific Research Publishing | Gratis | . |
| Open Journal of Metal | 2011- | Scientific Research Publishing | Gratis | . |
| Open Journal of Microphysics | 2011- | Scientific Research Publishing | Gratis | . |
| Open Journal of Modern Hydrology | 2011- | Scientific Research Publishing | Gratis | . |
| Open Journal of Modern Linguistics | 2011- | Scientific Research Journal Ltd. | Gratis | . |
| Open Journal of Modern Neurosurgery | 2011- | Scientific Research Publishing | Gratis | . |
| Open Journal of Molecular and Integrative Physiology | 2011- | Scientific Research Publishing | Gratis | . |
| Open Journal of Nephrology | 2011- | Scientific Research Publishing | Gratis | . |
| Open Journal of Nursing | 2011- | Scientific Research Publishing | Gratis | . |
| Open Journal of Obstetrics and Gynecology | 2011- | Scientific Research Publishing | Gratis | . |
| Open Journal of Occupational Therapy | 2012- | Western Michigan University | Gratis | . |
| Open Journal of Occupational Therapy | 2015- | Ebsco Academic | . | . |
| Open Journal of Occupational Therapy | 2012- | ProQuest Information and Learning | . | . |
| Open Journal of Ophthalmology | 2011- | Scientific Research Publishing | Gratis | . |
| Open Journal of Optimization | 2012- | Scientific Research Publishing | Gratis | . |
| Open Journal of Organ Transplant Surgery | 2011- | Scientific Research Journal Ltd. | Gratis | . |
| Open Journal of Organic Polymer Materials | 2011- | Scientific Research Publishing | Gratis | . |
| Open Journal of Orthopedics | 2011- | Scientific Research Publishing | Gratis | . |
| Open Journal of Pathology | 2011- | Scientific Research Publishing | Gratis | . |
| Open Journal of Pediatrics | 2011- | Scientific Research Publishing | Gratis | . |
| Open Journal of Philosophy | 2011- | Scientific Research Publishing | Gratis | . |
| Open Journal of Physical Chemistry | 2011- | Scientific Research Publishing | Gratis | . |
| Open Journal of Political Science | 2011- | Scientific Research Publishing | Gratis | . |
| Open Journal of Polymer Chemistry | 2011- | Scientific Research Publishing | Gratis | . |
| Open Journal of Preventive Medicine | 2011- | Scientific Research Publishing | Gratis | . |
| Open Journal of Psychiatry | 2011- | Scientific Research Publishing | Gratis | . |
| Open Journal of Psychiatry and Allied Sciences | 2015- | Academy Publisher | Gratis | Cambio de: Dysphrenia |
| Open Journal of Psychiatry and Allied Sciences | 2015- | Ebsco Academic | . | Cambio de: Dysphrenia |
| Open Journal of Radiology | 2011- | Scientific Research Publishing | Gratis | . |
| Open Journal of Regenerative Medicine | 2012- | Scientific Research Publishing | Gratis | . |
| Open Journal of Respiratory Diseases | 2011- | Scientific Research Publishing | Gratis | . |
| Open Journal of Rheumatology and Autoimmune Diseases | 2011- | Scientific Research Publishing | Gratis | . |
| Open Journal of Safety Science and Technology | 2011- | Scientific Research Publishing | Gratis | . |
| Open Journal of Soil Science | 2011- | Scientific Research Publishing | Gratis | . |
| Open Journal of Statistics | 2011- | Scientific Research Publishing | Gratis | . |
| Open Journal of Stomatology | 2011- | Scientific Research Publishing | Gratis | . |
| Open Journal of Synthesis Theory and Applications | 2012- | Scientific Research Publishing | Gratis | . |
| Open Journal of Therapy and Rehabilitation | 2013- | Scientific Research Publishing | Gratis | . |
| Open Journal of Thoracic Surgery | 2011- | Scientific Research Publishing | Gratis | . |
| Open Journal of Urology | 2011- | Scientific Research Publishing | Gratis | . |
| Open Journal of Veterinary Medicine | 2011- | Scientific Research Publishing | Gratis | . |
| Open Law Journal | 2008-2013 | Bentham open | Gratis | . |
| Open Learning | 1997- | Taylor & Francis | . | . |
| Open Learning | 1999- excepto últimos 12 meses | Ebsco Academic | . | . |
| Open Leukemia Journal | 2008-2013 | Bentham open | Gratis | . |
| Open Library of Humanities | 2015- | Open Library of Humanities | Gratis | . |
| Open Life Sciences | 2015- | de Gruyter | Gratis | Cambio de: Central European Journal of Biology |
| Open Life Sciences | 2018- | PubMed Central | Gratis | Cambio de: Central European Journal of Biology |
| Open Linguistics | 2015- | de Gruyter | Gratis | . |
| Open Longevity Science | 2007-2013 | Bentham open | Gratis | Cambio de: Open Aging Journal |
| Open Lung Cancer Journal | 2008-2011 | Bentham open | Gratis | . |
| Open Macromolecules Journal | 2007-2014 | Bentham open | Gratis | . |
| Open Magnetic Resonance Journal | 2008-2010 | Bentham open | Gratis | . |
| Open Management | 2023- | de Gruyter | Gratis | . |
| Open Management Journal | 2008-2013 | Bentham open | Gratis | . |
| Open Marine Biology Journal | 2007-2015 | Bentham open | Gratis | . |
| Open material sciences | 2018-2019 | de Gruyter | Gratis | Cambio de: Mesoporous biomaterials |
| Open material sciences | 2018-2019 | Portico | Gratis | Cambio de: Mesoporous biomaterials |
| Open Materials Science Journal | 2007-2019 | Bentham open | Gratis | . |
| Open Mathematics | 2015- | de Gruyter | Gratis | Cambio de: Central European Journal of Mathematics |
| Open Mathematics | 2003- | ProQuest Information and Learning | . | Cambio de: Central European Journal of Mathematics |
| Open Mathematics Journal | 2008-2015 | Bentham open | Gratis | . |
| Open Mechanical Engineering Journal | 2007-2020 | Bentham open | Gratis | . |
| Open Mechanics Journal | 2007-2013 | Bentham open | Gratis | . |
| Open Medical Devices Journal | 2009-2013 | Bentham open | Gratis | . |
| Open Medical Education Journal | 2008-2014 | Bentham open | Gratis | . |
| Open Medical Imaging Journal | 2007-2015 | Bentham open | Gratis | . |
| Open Medical Informatics Journal | 2007-2018 | PubMed Central | Gratis | . |
| Open Medical Informatics Journal | 2007-2019 | Bentham open | Gratis | . |
| Open Medicinal Chemistry Journal | 2007-2018 | PubMed Central | Gratis | . |
| Open Medicinal Chemistry Journal | 2007- | Bentham open | Gratis | . |
| Open Medicine | 2007-2014 | PubMed Central | Gratis | . |
| Open Medicine | 2015- | de Gruyter | Gratis | Cambio de: Central European Journal of Medicine |
| Open Medicine | 2015- | PubMed Central | Gratis | Cambio de: Central European Journal of Medicine |
| Open Medicine | 2015- excepto últimos 12 meses | ProQuest Information and Learning | . | Cambio de: Central European Journal of Medicine |
| Open Medicine Journal | 2014- | Bentham open | Gratis | . |
| Open Microalgae Biotechnology | 2021 | Bentham open | Gratis | . |
| Open Microbiology Journal | 2007-2018 | PubMed Central | Gratis | . |
| Open Microbiology Journal | 2007- | Bentham open | Gratis | . |
| Open Military Studies | 2020- | de Gruyter | Gratis | . |
| Open Mind | 2017- | MIT Press | Gratis | . |
| Open Mind | 2019- | PubMed Central | Gratis | . |
| Open Mind | 2017- | ProQuest Information and Learning | . | . |
| Open Mineral Processing Journal | 2008-2015 | Bentham open | Gratis | . |
| Open Mineralogy Journal | 2007-2011 | Bentham open | Gratis | . |
| Open Mycology Journal | 2007-2014 | Bentham open | Gratis | . |
| Open Nanomedicine Journal | 2008-2010 | Bentham open | Gratis | . |
| Open Nanoscience Journal | 2007-2014 | Bentham open | Gratis | . |
| Open Natural Products Journal | 2008-2015 | Bentham open | Gratis | . |
| Open Neuroendocrinology Journal | 2008-2012 | Bentham open | Gratis | . |
| Open Neuroimaging Journal | 2007-2018 | PubMed Central | Gratis | . |
| Open Neuroimaging Journal | 2007- | Bentham open | Gratis | . |
| Open Neurology Journal | 2007-2018 | PubMed Central | Gratis | . |
| Open Neurology Journal | 2007- | Bentham open | Gratis | . |
| Open Neuropsychopharmacology Journal | 2008-2012 | Bentham open | Gratis | . |
| Open Neuroscience Journal | 2007-2014 | Bentham open | Gratis | . |
| Open Neurosurgery Journal | 2010-2015 | Bentham open | Gratis | . |
| Open Nitric Oxide Journal | 2008-2013 | Bentham open | Gratis | . |
| Open Nuclear & Particle Physics Journal | 2008-2013 | Bentham open | Gratis | . |
| Open Nuclear Medicine Journal | 2009-2014 | Bentham open | Gratis | . |
| Open Numerical Methods Journal | 2009-2012 | Bentham open | Gratis | . |
| Open Nursing Journal | 2007-2018 | PubMed Central | Gratis | . |
| Open Nursing Journal | 2007- | Bentham open | Gratis | . |
| Open Nutraceuticals Journal | 2008-2015 | Bentham open | Gratis | . |
| Open Nutrition Journal | 2007-2021 | Bentham open | Gratis | . |
| Open Obesity Journal | 2009-2015 | Bentham open | Gratis | . |
| Open Occupational Health & Safety Journal | 2009-2014 | Bentham open | Gratis | . |
| Open Ocean Engineering Journal | 2010-2013 | Bentham open | Gratis | . |
| Open Oceanography Journal | 2007-2015 | Bentham open | Gratis | . |
| Open Operational Research Journal | 2007-2013 | Bentham open | Gratis | . |
| Open Ophthalmology Journal | 2007- | Bentham open | Gratis | . |
| Open Ophthalmology Journal | 2007-2018 | PubMed Central | Gratis | . |
| Open Optics Journal | 2007-2015 | Bentham open | Gratis | . |
| Open Organic Chemistry Journal | 2007-2015 | Bentham open | Gratis | . |
| Open Ornithology Journal | 2008-2020 | Bentham open | Gratis | . |
| Open Orthopaedics Journal | 2007-2018 | PubMed Central | Gratis | . |
| Open Orthopaedics Journal | 2007- | Bentham open | Gratis | . |
| Open Otorhinolaryngology Journal | 2007-2015 | Bentham open | Gratis | . |
| Open Pacing Electrophysiology and Therapy Journal | 2008-2013 | Bentham open | Gratis | . |
| Open Pain Journal | 2009- | Bentham open | Gratis | . |
| Open Paleontology Journal | 2008-2014 | Bentham open | Gratis | . |
| Open Parasitology Journal | 2007-2014 | Bentham open | Gratis | . |
| Open Pathology Journal | 2007-2014 | Bentham open | Gratis | . |
| Open Pediatric Medicine Journal | 2007-2014 | Bentham open | Gratis | . |
| Open Petroleum Engineering Journal | 2008-2019 | Bentham open | Gratis | . |
| Open Pharmacoeconomics & Health Economics Journal | 2009-2013 | Bentham open | Gratis | . |
| Open Pharmacology Journal | 2007-2013 | Bentham open | Gratis | . |
| Open Philosophy | 2018- | De Gruyter | Gratis | . |
| Open Philosophy | 2022- | Ebsco Academic | . | . |
| Open Physical Chemistry Journal | 2007-2014 | Bentham open | Gratis | . |
| Open Physics | 2015- | de Gruyter | Gratis | Cambio de: Central European Journal of Physics |
| Open Physiology Journal | 2008-2013 | Bentham open | Gratis | . |
| Open Plant Science Journal | 2007-2019 | Bentham open | Gratis | . |
| Open Plasma Physics Journal | 2008-2015 | Bentham open | Gratis | . |
| Open Political Science | 2018- | De Gruyter | Gratis | . |
| Open Political Science Journal | 2008-2015 | Bentham open | Gratis | . |
| Open praxis | 2006- | International Council for Open and Distance Education | Gratis | . |
| Open Process Chemistry Journal | 2008-2014 | Bentham open | Gratis | . |
| Open Prostate Cancer Journal | 2009-2015 | Bentham open | Gratis | . |
| Open Proteomics Journal | 2008-2014 | Bentham open | Gratis | . |
| Open Psychiatry Journal | 2007-2015 | Bentham open | Gratis | . |
| Open Psychology | 2019- | De Gruyter | Gratis | . |
| Open Psychology Journal | 2008- | Bentham open | Gratis | . |
| Open Public Health Journal | 2008- | Bentham open | Gratis | . |
| Open Quaternary | 2015- | Ubiquity Press | Gratis | . |
| Open Quaternary | 2017- | Ebsco Academic | . | . |
| Open Reconstructive and Cosmetic Surgery | 2008-2010 | Bentham open | Gratis | . |
| Open Rehabilitation Journal | 2008-2015 | Bentham open | Gratis | . |
| Open Renewable Energy Journal | 2008-2015 | Bentham open | Gratis | . |
| Open Reproductive Science Journal | 2008-2015 | Bentham open | Gratis | . |
| Open Research Africa | 2022- | F1000 Research | Gratis | Cambio de: AAS Open Research |
| Open Research Africa | 2022- | PubMed Central | Gratis | Cambio de: AAS Open Research |
| Open Research Computation | 2011-2013 | BioMed Central | Gratis | . |
| Open Research Europe | 2021- | F1000 Research Limited | Gratis | . |
| Open Research Europe | 2021- | PubMed Central | Gratis | . |
| Open Respiratory Archives | 2019- | Elsevier Science | Gratis | . |
| Open Respiratory Archives | 2019- | Elsevier Science | Gratis | . |
| Open Respiratory Archives | 2021- | PubMed Central | Gratis | . |
| Open Respiratory Medicine Journal | 2007- | Bentham open | Gratis | . |
| Open Respiratory Medicine Journal | 2007- | PubMed Central | Gratis | . |
| Open Review of Educational Research | 2014-2019 | Taylor & Francis | Gratis | . |
| Open Review of Educational Research | 2017-2017 | ProQuest Information and Learning | . | . |
| Open Rheumatology Journal | 2007-2018 | PubMed Central | Gratis | . |
| Open Rheumatology Journal | 2007- | Bentham open | Gratis | . |
| Open Rivers | 2016- | University of Minnesota Libraries Publishing | Gratis | . |
| Open Screens | 2018- | Open Humanities Press | Gratis | . |
| Open Signal Processing Journal | 2008-2013 | Bentham open | Gratis | . |
| Open Sleep Journal | 2008-2015 | Bentham open | Gratis | . |
| Open Social Science Journal | 2008-2015 | Bentham open | Gratis | . |
| Open Sociology Journal | 2008-2010 | Bentham open | Gratis | . |
| Open Software Engineering Journal | 2007-2013 | Bentham open | Gratis | . |
| Open source business resource CSBR | 2007-2011 | Talent First Network | Gratis | Cambio a: Technology Innovation Management Review |
| Open source business resource CSBR | 2007-2011 | ProQuest Information and Learning | . | Cambio a: Technology Innovation Management Review |
| Open Source for You | 2013- | ProQuest Information and Learning | . | . |
| Open Source Science Journal | 2009-2010 | Open Source Science Journal | Gratis | . |
| Open Spectroscopy Journal | 2007-2015 | Bentham open | Gratis | . |
| Open Spine Journal | 2009-2014 | Bentham open | Gratis | . |
| Open Sports Medicine Journal | 2007-2015 | Bentham open | Gratis | . |
| Open Sports Sciences Journal | 2008- | Bentham open | Gratis | . |
| Open Statistics | 2020-2022 | de Gruyter | Gratis | . |
| Open Statistics & Probability Journal | 2009-2020 | Bentham open | Gratis | . |
| Open Stem Cell Journal | 2009-2013 | Bentham open | Gratis | . |
| Open Structural Biology Journal | 2007-2013 | Bentham open | Gratis | . |
| Open Superconductors Journal | 2009-2013 | Bentham open | Gratis | . |
| Open Surface Science Journal | 2009-2015 | Bentham open | Gratis | . |
| Open Surgery Journal | 2007-2015 | Bentham open | Gratis | . |
| Open Surgical Oncology Journal | 2009-2014 | Bentham open | Gratis | . |
| Open Systems & Information Dynamics | 2001- | World Scientific Publishing Company | . | . |
| Open Systems Biology Journal | 2008-2012 | Bentham open | Gratis | . |
| Open Textile Journal | 2008-2013 | Bentham open | Gratis | . |
| Open Theology | 2015- | de Gruyter | Gratis | . |
| Open Theology | 2016- | Ebsco Academic | . | . |
| Open Thermodynamics Journal | 2007-2013 | Bentham open | Gratis | . |
| Open Tissue Engineering & Regenerative Medicine Journal | 2008-2013 | Bentham open | Gratis | . |
| Open Toxicology Journal | 2007-2013 | Bentham open | Gratis | . |
| Open Toxinology Journal | 2008-2013 | Bentham open | Gratis | . |
| Open Translational Medicine Journal | 2009-2011 | Bentham open | Gratis | . |
| Open Transplantation Journal | 2007-2015 | Bentham open | Gratis | . |
| Open Transport Phenomena Journal | 2009-2013 | Bentham open | Gratis | . |
| Open Transportation Journal | 2007- | Bentham open | Gratis | . |
| Open Transportation Journal | 2012- | ProQuest Information and Learning | . | . |
| Open Tropical Medicine Journal | 2008-2014 | Bentham open | Gratis | . |
| Open Urban Studies and Demography Journal | 2015-2018 | Bentham open | Gratis | . |
| Open Urban Studies Journal | 2008-2013 | Bentham open | Gratis | . |
| Open Urology & Nephrology Journal | 2008- | Bentham open | Gratis | . |
| Open Vaccine Journal | 2008-2013 | Bentham open | Gratis | . |
| Open Veterinary Journal | 2011- | PubMed Central | Gratis | . |
| Open Veterinary Journal | 2015- | Ebsco Academic | . | . |
| Open Veterinary Journal | 2011- | National Authority for Scientific Research & Tripoli University | Gratis | . |
| Open Veterinary Journal | 2011- | PubMed Central | Gratis | . |
| Open Veterinary Journal | 2011- | AJOL | Gratis | . |
| Open Veterinary Science | 2020- | de Gruyter | Gratis | . |
| Open Veterinary Science | 2021- | Ebsco Academic | . | . |
| Open Veterinary Science Journal | 2007-2015 | Bentham open | Gratis | . |
| Open Virology Journal | 2007-2018 | PubMed Central | Gratis | . |
| Open Virology Journal | 2007-2021 | Bentham open | Gratis | . |
| Open Virtual Reality Journal | 2009-2011 | Bentham open | Gratis | . |
| Open Waste Management Journal | 2008-2020 | Bentham open | Gratis | . |
| Open Women's Health Journal | 2007-2012 | Bentham open | Gratis | . |
| Open Zoology Journal | 2008-2013 | Bentham open | Gratis | . |
| OpenDemocracy | 2012- | ProQuest Information and Learning | . | . |
| Opening Writing Doors Journal | 2012- | . | Gratis | . |
| Openings Studies in Book Art | 2012- | Simon Fraser University | Gratis | . |
| OpenNano | 2016- | Elsevier Science | Gratis | . |
| OpenPhysio | 2018- | Physiopedia | Gratis | . |
| Opera botanica | 1977-1977 | BioDiversity Heritage Library | Gratis | . |
| Opera Canada | 1993-2013 | ProQuest Information and Learning | . | . |
| Opera Corcontica | 2009- | Ebsco Academic | . | . |
| Opera Corcontica | 2002- | ProQuest Information and Learning | . | . |
| Opera Medica & Physiologica | 2015- | Lobachevsky State University of Nizhny Novgorod | Gratis | . |
| Opera News | 2012-2017 | Ebsco Academic | . | . |
| Opera News | 1988-2016 | ProQuest Information and Learning | . | . |
| OPERA Observatorio de Políticas Ejecución y Resultados de la Administración Pública | 2001- | Red ALyC | Gratis | . |
| OPERA Observatorio de Políticas Ejecución y Resultados de la Administración Pública | 2006- | Ebsco Academic | . | . |
| OPERA Observatorio de Políticas Ejecución y Resultados de la Administración Pública | 2001- | Universidad Externado de Colombia | Gratis | . |
| OPERA Observatorio de Políticas Ejecución y Resultados de la Administración Pública | 2001- | Dialnet | Gratis | . |
| Opera Quarterly, The | 1996- | Oxford Academic | . | . |
| Opera Quarterly, The | 1996- excepto últimos 12 meses | Ebsco Academic | . | . |
| Opera Quarterly, The | 1997-1999 | ProQuest Information and Learning | . | . |
| Opera Quarterly, The | 2002- | Project Muse | . | . |
| Opera slavica | 1991- | Masaryk University | Gratis | . |
| Operating Theatre Journal | 2009-2024 | Ebsco Academic | . | . |
| Operational Physics | 2006-2006 | Springer Series | . | . |
| Operational Research | 2001- | Springer | . | . |
| Operational Research | 2001- excepto últimos 12 meses | ProQuest Information and Learning | . | . |
| Operational Research in Engineering Sciences: Theory and Applications | 2018- | Regional Association for Security and crisis management, Belgrade, Serbia | Gratis | . |
| Operational Research Quarterly | 1950-1952 | JSTOR | . | Cambio a: OR |
| Operational Research Quarterly | 1970-1977 | JSTOR | . | Cambio de: OR | Cambio a: Journal of the Operational Research Society |
| Operational Risk & Regulation | 2009-2015 | ProQuest Information and Learning | . | . |
| Operations & Fulfillment | 2002-2005 | Ebsco Academic | . | . |
| Operations and Supply Chain Management | 2022- | Sepuluh Nopember Institute of Technology | Gratis | . |
| Operations and Supply Chain Management | 2024- | Ebsco Academic | . | . |
| Operations Management | 1997-2009 | Ebsco Academic | . | . |
| Operations Management | 1997-2009 | ProQuest Information and Learning | . | . |
| Operations Management 1755 1501 | 2010-2016 | Ebsco Academic | . | . |
| Operations Management Education Review | 2009-2011 | ProQuest Information and Learning | . | . |
| Operations Management Research | 2008- | Springer | . | . |
| Operations Management Research | 2008- excepto últimos 12 meses | ProQuest Information and Learning | . | . |
| Operations Research | 1956- excepto últimos 60 meses | JSTOR | . | Cambio de: Journal of the Operations Research Society of America |
| Operations Research | 1956- | Ebsco Academic | . | Cambio de: Journal of the Operations Research Society of America |
| Operations Research | 1998- | INFORMS | . | Cambio de: Journal of the Operations Research Society of America |
| Operations Research | 1987-2009 | ProQuest Information and Learning | . | Cambio de: Journal of the Operations Research Society of America |
| Operations research and decisions | 2005- | Ebsco Academic | . | . |
| Operations research and decisions | 2010- | Wrocław University of Technology | Gratis | . |
| Operations Research Computer Science Interfaces Series | 2005- | Springer Series | . | . |
| Operations Research Data Analytics and Logistics | 2025- | Elsevier Science | . | Cambio de: Operations Research for Health Care |
| Operations Research for Health Care | 2012-2025 | Elsevier Science | . | Cambio a: Operations Research, Data Analytics and Logistics |
| Operations Research Forum | 2020- | Springer | . | . |
| Operations Research Forum | 2020- excepto últimos 12 meses | ProQuest Information and Learning | . | . |
| Operations Research Letters | 1981- | Elsevier Science | . | . |
| Operations Research Perspectives | 2014- | Elsevier Science | Gratis | . |
| Operations Research Proceedings | 2005-2008 | Springer Series | . | . |
| Operative dentistry | 1976- excepto últimos 36 meses | Allen Press | Gratis | Cambio de: Journal of the American Academy of Gold Foil Operators |
| Operative dentistry | 1976- | Allen Press | . | Cambio de: Journal of the American Academy of Gold Foil Operators |
| Operative Neurosurgery | 2011- | Ovid Technologies, Inc. | . | . |
| Operative Neurosurgery | 2005-2021 | Oxford Academic | . | . |
| Operative Neurosurgery | 2017- excepto últimos 12 meses | PubMed Central | Gratis Artículos selectos | . |
| Operative Neurosurgery | 2011- | Lippincott Williams & Wilkins | . | . |
| Operative Neurosurgery | 2016-2021 | ProQuest Information and Learning | . | . |
| Operative Orthopädie und Traumatologie | 1989- | Springer | . | . |
| Operative Techniques in Cardiac and Thoracic Surgery | 1996-1998 | Elsevier Science | . | Cambio a: Operative Techniques in Thoracic and Cardiovascular Surgery |
| Operative Techniques in General Surgery | 1999-2008 | Elsevier Science | . | . |
| Operative Techniques in Orthopaedics | 1991- | Elsevier Science | . | . |
| Operative Techniques in Orthopaedics | 2007- | Clinical Key | . | . |
| Operative Techniques in Otolaryngology-Head and Neck Surgery | 1994- | Elsevier Science | . | . |
| Operative Techniques in Otolaryngology-Head and Neck Surgery | 2007- | Clinical Key | . | . |
| Operative Techniques in Plastic and Reconstructive Surgery | 1994-2002 | Elsevier Science | . | . |
| Operative Techniques in Sports Medicine | 1993- | Elsevier Science | . | . |
| Operative Techniques in Sports Medicine | 2007- | Clinical Key | . | . |
| Operative Techniques in Thoracic and Cardiovascular Surgery | 1998- | Elsevier Science | . | Cambio de: Operative Techniques in Cardiac and Thoracic Surgery |
| Operative Techniques in Thoracic and Cardiovascular Surgery | 1998- excepto últimos 24 meses | Elsevier Science | Gratis | Cambio de: Operative Techniques in Cardiac and Thoracic Surgery |
| Operative Techniques in Thoracic and Cardiovascular Surgery | 2007- | Clinical Key | . | Cambio de: Operative Techniques in Cardiac and Thoracic Surgery |
| Operatives Free Press | 1849 | Gale MOMW | . | . |
| Operator Theory Advances and Applications | 2005- | Springer Series | . | . |
| Õpetatud Eesti Seltsi Aastaraamat Yearbook of the Learned Estonian Society | 2010- | Õpetatud Eesti Selts | Gratis | . |
| Opflow Online | 2012- excepto últimos 12 meses | Ebsco Academic | . | . |
| Opflow Online | 1997- | Wiley Online Library | . | . |
| Ophelia | 1997-2004 | Taylor & Francis | . | Cambio a: Marine Biology Research |
| Ophidia | 2015- | Ebsco Academic | . | . |
| Ophthalmic & Physiological Optics | 2003- excepto últimos 12 meses | Ebsco Academic | . | . |
| Ophthalmic & Physiological Optics | 1997- | Wiley Online Library | . | . |
| Ophthalmic Epidemiology | 1997- excepto últimos 12 meses | Ebsco Academic | . | . |
| Ophthalmic Epidemiology | 1997- | Taylor & Francis | . | . |
| Ophthalmic Genetics | 1997- | Taylor & Francis | . | . |
| Ophthalmic Genetics | 1998- excepto últimos 12 meses | Ebsco Academic | . | . |
| Ophthalmic hospital reports and journal of the Royal London Ophthalmic Hospital | 1857-1859 | Wellcome Library | Gratis | . |
| Ophthalmic Plastic & Reconstructive Surgery | 2015- | Ovid Technologies, Inc. | . | . |
| Ophthalmic Research | 1998-2020 | Karger Publishers | . | . |
| Ophthalmic Research | 2007-2012 | PubMed Central | Gratis Artículos selectos | . |
| Ophthalmic Research | 1998-2015 | ProQuest Information and Learning | . | . |
| Ophthalmic Research | 2021- | Karger Publishers | Gratis | . |
| Ophthalmic Surgery Lasers & Imaging Retina | 1976- | ProQuest Information and Learning | . | . |
| Ophthalmologica Extra | 2014- | Karger Publishers | Gratis | . |
| Ophthalmologica Extra | 2014-2014 | Ebsco Academic | . | . |
| Ophthalmologica International Journal of Ophthalmology | 2009-2009 | PubMed Central | Gratis Artículos selectos | . |
| Ophthalmologica International Journal of Ophthalmology | 1998- | Karger Publishers | . | . |
| Ophthalmologica International Journal of Ophthalmology | 1938- excepto últimos 12 meses | Ebsco Academic | . | . |
| Ophthalmologica International Journal of Ophthalmology | 1998-2015 | ProQuest Information and Learning | . | . |
| Ophthalmology | 2007- | Clinical Key | . | . |
| Ophthalmology 1816 5095 | 2012- | Ophthalmology Publishing Group | Gratis | . |
| Ophthalmology and Eye Diseases | 2009-2017 | Sage Journals | Gratis | Cambio a: Therapeutic advances in ophthalmology |
| Ophthalmology and Eye Diseases | 2009-2017 | PubMed Central | Gratis | Cambio a: Therapeutic advances in ophthalmology |
| Ophthalmology and Therapy | 2012- | Springer | Gratis | . |
| Ophthalmology and Therapy | 2012- | PubMed Central | Gratis | . |
| Ophthalmology and Therapy | 2015- | Ebsco Academic | . | . |
| Ophthalmology and Therapy | 2012-2019 | ProQuest Information and Learning | . | . |
| Ophthalmology Journal | 2016- | Via Medica | Gratis | . |
| Ophthalmology Research | 2006- | Springer Series | . | . |
| Ophthalmology Science | 2021- | Elsevier Science | Gratis | . |
| Ophthalmology Science | 2021- | PubMed Central | Gratis | . |
| Ophthalmology Times | 2001- | Advanstar Communications Ltd. | Gratis | . |
| Ophthalmology Times | 2002- | Ebsco Academic | . | . |
| Ophthalmology Times | 1998- | ProQuest Information and Learning | . | . |
| Ophthalmology Times Europe | 2014- | Ebsco Academic | . | . |
| Ophthalmology Update | 2015-2021 | Ebsco Academic | . | . |
| Opinião Pública | 2000- | SciELO (Brasil) | Gratis | . |
| Opinião Pública | 2000- | Red ALyC | Gratis | . |
| Opinião Pública | 2012- | Ebsco Academic | . | . |
| Opinião Pública | 2012- | ProQuest Information and Learning | . | . |
| Opinião Pública | 1993- | UNICAMP | Gratis | . |
| Opinion Armed Forces War College | 2013-2015 | National Defence University | Gratis | . |
| Opinión Barcelona | 2008- | CIDOB | Gratis | . |
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| Opinión gallega | 1945-1953 | Galiciana | Gratis | . |
| Opinión gallegista | 1934-1935 | Galiciana | Gratis | . |
| Opinion La diario de Pontevedra | 1896-1897 | Galiciana | Gratis | . |
| Opinion La semanario independiente | 1911 | Galiciana | Gratis | . |
| Opìr Materìalìv ì Teorìâ Sporud | 2009- | Kyiv National University of Construction and Architecture | Gratis | . |
| Opisthobranch | 1984-1984 | BioDiversity Heritage Library | Gratis | . |
| Opisthobranch newsletter | 1969-1983 | BioDiversity Heritage Library | Gratis | . |
| Opolis An International Journal of Suburban and Metropolitan Studies | 2004-2006 | University of California | Gratis | . |
| Opolskie Studia Administracyjno-Prawne | 2016- | Wydawnictwo Uniwersytetu Opolskiego | Gratis | . |
| Opportunities for Research in Renaissance Drama | 1958-1059 | JSTOR | . | Cambio de: Renaissance Drama (1956-1957) | Cambio a: Renaissance Drama, a Report on Research Opportunities |
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| Opsearch | 1997- | Springer | . | . |
| Opsearch | 1997-2019 | ProQuest Information and Learning | . | . |
| OPSI | 2016- | Universitas Pembangunan Nasional 'Veteran' Yogyakarta | Gratis | . |
| OPSIS Revista do Departamento de História e Ciências Sociais | 2001- | Universidade Federal de Goiás | Gratis | . |
| Optica | 2014- | Optica Publishing Group | Gratis | . |
| Optica Acta International Journal of Optics | 1954-1986 | Taylor & Francis | . | Cambio a: Journal of Modern Optics |
| Optica Applicata | 1971- | Wroclaw University of Technology | Gratis | . |
| Optica Applicata | 2005- | Ebsco Academic | . | . |
| Óptica Pura y Aplicada | 1990- | Sociedad Española de Optica - Sedoptica | Gratis | . |
| Óptica Pura y Aplicada | 2013- | Ebsco Academic | . | . |
| Optica Quantum | 2023- | Optica Publishing Group | Gratis | . |
| Optical & Quantum Electronics | 2003- excepto últimos 12 meses | Ebsco Academic | . | Cambio de: Opto-electronics |
| Optical & Quantum Electronics | 1975- | Springer | . | Cambio de: Opto-electronics |
| Optical and Fiber Communications Reports | 2005-2011 | Springer Series | . | . |
| Optical Data Processing and Storage | 2015- | de Gruyter | Gratis | . |
| Optical Engineering | 1962- | SPIE Digital Library | . | . |
| Optical Fiber Technology | 1994- | Elsevier Science | . | . |
| Optical Materials | 1992- | Elsevier Science | . | . |
| Optical Materials Express | 2011- | Optica Publishing Group | Gratis | . |
| Optical Materials X | 2019- | Elsevier Science | Gratis | . |
| Optical Memory & Neural Networks | 2007- | Springer | . | . |
| Optical Memory News | 1995-1998 | ProQuest Information and Learning | . | . |
| Optical Nanoscopy | 2012-2014 | SpringerOpen | Gratis | . |
| Optical Nanoscopy | 2012-2014 | ProQuest Information and Learning | . | . |
| Optical Nanoscopy | 2013-2013 | Ebsco Academic | . | . |
| Optical Nanoscopy | 2012-2014 | Springer | . | . |
| Optical Networks | 2005- | Springer Series | . | . |
| Optical Review | 1994-1999 | J-STAGE, Japan Science and Technology Information Aggregator, Electronic | Gratis | . |
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| Optical Switching and Networking | 2005- | Elsevier Science | . | . |
| Optical World | 2013- | Ebsco Academic | . | . |
| Optician | 2003-2015 | ProQuest Information and Learning | . | . |
| Opticon1826 | 2006-2015 | University College London | Gratis | . |
| Optics | 2020- | MDPI AG | Gratis | . |
| Optics | 2020- | ProQuest Information and Learning | . | . |
| Optics & Laser Technology | 1971- | Elsevier Science | . | Cambio de: Optics Technology |
| Optics & Spectroscopy | 2000- excepto últimos 12 meses | Ebsco Academic | . | . |
| Optics & Spectroscopy | 2000- | Springer | . | . |
| Optics and Lasers in Engineering | 1980- | Elsevier Science | . | . |
| Optics and Photonics Journal | 2011- | Scientific Research Publishing | Gratis | . |
| Optics and Photonics Letters | 2008- | World Scientific Publishing Company | Gratis | . |
| Optics and Photonics News | 1990- | Optical Society of America | . | Cambio de: Optics News |
| Optics Communications | 1969- | Elsevier Science | . | . |
| Optics Continuum | 2022- | Optica Publishing Group | Gratis | Cambio de: OSA Continuum |
| Optics Express | 2009- excepto últimos 12 meses | PubMed Central | Gratis Artículos selectos | . |
| Optics Express | 1997- | Optica Publishing Group | Gratis | . |
| Optics Letters | 1977- | Optica Publishing Group | . | . |
| Optics News | 1975-1989 | Optica Publishing Group | . | Cambio a: Optics & Photonics News |
| Optics Technology | 1968-1970 | Elsevier Science | . | . |
| Optik & Photonik | 2012-2018 | Ebsco Academic | . | . |
| Optik & Photonik | 2006-2018 | Wiley Online Library | Gratis | . |
| Optik - International Journal for Light and Electron Optics | 2001- | Elsevier Science | . | . |
| Optima Newsletter | 1996-2015 | OPTIMA - Organization for the Phyto-Taxonomic Investigation of the | Gratis | . |
| Optimal Control Applications And Methods | 1996- | Wiley Online Library | . | . |
| Optimization | 1997- | Taylor & Francis | . | . |
| Optimization and Engineering | 2000- | Springer | . | . |
| Optimization Journal of Research in Management | 2017- | Ebsco Academic | . | . |
| Optimization Letters | 2007- | Springer | . | . |
| Optimization Methods & Software | 1997- | Taylor & Francis | . | . |
| Optimization Methods & Software | 2002- excepto últimos 12 meses | Ebsco Academic | . | . |
| Optimization of Ornamental & Garden Plant Assortment Technologies & Environment | 2014- | Ebsco Academic | . | . |
| Optimize | 2002-2007 | ProQuest Information and Learning | . | . |
| OptiMSt | 1975-2002 | ProQuest Information and Learning | . | . |
| Optimum economic studies | 2013- | CEEOL | Gratis | . |
| Optimum Ekonomi ve Yonetim Bilimleri Dergisi | 2014- | Dergipark | Gratis | . |
| Optimum Ekonomi ve Yonetim Bilimleri Dergisi | 2014- | Ebsco Academic | . | . |
| Optimum Online | 1998-2019 | Wayback Machine | Gratis | . |
| Optimum Online | 2006-2019 | Ebsco Academic | . | . |
| Optimum Wellness | 2008-2011 | ProQuest Information and Learning | . | . |
| Option Bio | 2008- | Elsevier Science | . | . |
| Opto and Laser Europe | 2001- | Optics | Gratis | . |
| Opto Electronic Advances | 2021- | Institue of Optics and Electronics, Chinese Academy of Sciences | Gratis | . |
| Opto Electronic Advances | 2018-2021 | ProQuest Information and Learning | . | . |
| Opto-Electronic Science | 2022- | Editorial Office of Opto-Electronic Journals, Institute of Optics and Electronics, CAS, China | Gratis | . |
| Opto-electronics | 1969-1974 | Springer | . | Cambio a: Optical and quantum electronics |
| Opto-Electronics Review | 1992-2005 | Polish Academy of Sciences | Gratis | . |
| Opto-Electronics Review | 2006-2014 | Springer | . | . |
| Opto-Electronics Review | 2006-2016 | de Gruyter | . | . |
| Opto-Electronics Review | 2015- | Polish Academy of Sciences | Gratis | . |
| Optoelectronics and Advanced Materials-Rapid Communications | 2007- | National Institute of Optoelectronics | Gratis | . |
| Optoelectronics Instrumentation and Data Processing | 2007- | Springer | . | . |
| Optoelectronics Letters | 2005- | Springer | . | . |
| Optofluidics Microfluidics and Nanofluidics | 2014- | de Gruyter | Gratis | Cambio de: Optofluidics |
| Optogenetics | 2013-2013 | Portico | Gratis | . |
| Optometria clinica y ciencias de la vision | 2022- | Sociedad Aragonesa de Optometría y Contactología | Gratis | . |
| Optometric Education | 2008- | Association of Schools and Colleges of Optometry | Gratis | . |
| Optometric Management | 1998-2013 | ProQuest Information and Learning | . | . |
| Optometry & Vision Development | 2005-2012 | College of Optometrists in Vision Development | Gratis | . |
| Optometry & Vision Development | 2005-2012 | Ebsco Academic | . | . |
| Optometry & Vision Science | 2009- | Ovid Technologies, Inc. | . | . |
| Optometry & Vision Science | 1989- excepto últimos 12 meses | Lippincott Williams & Wilkins | Gratis | . |
| Optometry & Visual Performance | 2013- | Optometric Extension Program Foundation | Gratis | . |
| Optometry & Visual Performance | 2014- | Ebsco Academic | . | . |
| Optometry - Journal of the American Optometric Association | 2004-2012 | Elsevier Science | . | . |
| Optometry in Practice | 2012- | Ebsco Academic | . | . |
| Optometry Reports | 2011-2016 | PAGEPress | Gratis | . |
| Optometry Reports | 2012-2016 | Ebsco Academic | . | . |
| Optometry Times | 2009- | Ebsco Academic | . | . |
| Optometry Times | 2013- | ProQuest Information and Learning | . | . |
| Optometry Today | 2008- | Ebsco Academic | . | . |
| Opukholi zhenskoi reproduktivnoi sistemy | 2008- | . | Gratis | . |
| Opuntia Brava | 2009- | Universidad de Ciencias Pedagógicas 'Pepito Tey'; Editorial Académica Universitaria | Gratis | . |
| Opus | 2009- | Associação Nacional de Pesquisa e Pós-Graduação em Música | Gratis | . |
| OPUS HR Journal | 2015- | Ebsco Academic | . | . |
| OPUS HR Journal | 2013-2022 | ProQuest Information and Learning | . | . |
| Opus Incertum | 2015- | Firenze University Press | Gratis | . |
| Opus Musicum | 2011- | Ebsco Academic | . | . |
| Opuscula Annual of the Swedish Institutes at Athens and Rome | 2008- | Svenska institutet I Athen | Gratis | . |
| Opuscula Historae Artium | 2015- | Ebsco Academic | . | . |
| Opuscula Mathematica | 2004- | AGH University of Science and Technology | Gratis | . |
| Opuscula Mathematica | 2013- | Ebsco Academic | . | . |
| Opuscula Musealia | 2010- | Ebsco Academic | . | . |
| Opuscula Musealia | 2010- | Wydawnictwo Uniwersytetu Jagiellonskiego | Gratis | . |
| Opuscula Musealia | 2010-2022 | ProQuest Information and Learning | . | . |
| Opuscula Philolichenum | 2004- | New York Botanical Garden | Gratis | . |
| Opuscula Short texts of the Middle Ages and Renaissance | 2011- | University of Calgary | Gratis | . |
| Opuscula Theologica et Scientifica | 2023- | John Wesley Theological College | Gratis | . |
| Opuscula zoologica | 1957-1975 | BioDiversity Heritage Library | Gratis | . |
| Opuscula Zoologica Instituti Zoosystematici et Oecologici Universitatis Budapestinensis | 2001- | Eötvös Loránd University | Gratis | . |
| Opuscula Zoologica Instituti Zoosystematici et Oecologici Universitatis Budapestinensis | 2010- | Ebsco Academic | . | . |
| Opusculum | 2000- | Humboldt-Universität zu Berlin | Gratis | . |
| Opvscvla Archaeologica Papers of the Department of Archaeology | 1956- | Hrcak | Gratis | . |
| Opšta Medicina | 2014- | SCIndeks: Serbian Citation Index | Gratis | . |
| OQ | 1998-2005 | ProQuest Information and Learning | . | . |
| Oqimta | 2019- | Ebsco Academic | . | . |
| OR | 1953-1969 | JSTOR | . | Cambio de: Operational Research Quarterly (1950-1952) | Cambio a: Operational Research Quarterly (1970-1977) |
| OR Insight | 2008-2013 | ProQuest Information and Learning | . | . |
| OR manager | 2005-2015 | Ebsco Academic | . | . |
| OR manager | 2000-2015 | ProQuest Information and Learning | . | . |
| OR Nurse | 2007-2015 | Ovid Technologies, Inc. | . | . |
| OR Spectrum | 2002- | Springer | . | Cambio de: OR Spektrum |
| OR Spectrum | 2002- excepto últimos 12 meses | Ebsco Academic | . | Cambio de: OR Spektrum |
| OR Spectrum | 2002- excepto últimos 12 meses | ProQuest Information and Learning | . | Cambio de: OR Spektrum |
| OR Spektrum Organ der Deutschen Gesellschaft für Operations Research | 1979-2001 | Springer | . | Cambio a: OR spectrum |
| Oracle The Research Journal of the Association of Fraternity Sorority Advisors | 2012-2022 | Ebsco Academic | . | . |
| Oradea Journal of Business and Economics | 2016- | University of Oradea Publishing House | Gratis | . |
| Oradea Journal of Business and Economics | 2016- | University of Oradea | Gratis | . |
| Oráfrica revista de oralidad africana | 2005- | RACO | Gratis | . |
| Oral | 1999- | Imbiomed | Gratis Registro individual requerido | . |
| Oral | 2006- | Medigraphic | Gratis | . |
| Oral & Craniofacial Tissue Engineering | 2011-2012 | Ebsco Academic | . | . |
| Oral & Implantology | 2008-2017 | PubMed Central | Gratis | . |
| Oral & Implantology | 2008- | CIC Edizioni Internazionali | Gratis | . |
| Oral & Implantology | 2012- | Ebsco Academic | . | . |
| Oral & Maxillofacial Pathology Journal | 2010- | Kairali Society of Oral & Maxillofacial Pathologists | Gratis | . |
| Oral & Maxillofacial Pathology Journal | 2010- | Ebsco Academic | . | . |
| Oral — Health, Diseases, Therapies, and Technologies | 2021- | MDPI AG | Gratis | . |
| Oral — Health, Diseases, Therapies, and Technologies | 2021- | ProQuest Information and Learning | . | . |
| Oral — Health, Diseases, Therapies, and Technologies | 2021- | Ebsco Academic | . | . |
| Oral and Maxillofacial Surgery | 2008- | Springer | . | Cambio de: Mund-, Kiefer- und Gesichtschirurgie |
| Oral and Maxillofacial Surgery | 2013- excepto últimos 12 meses | Ebsco Academic | . | Cambio de: Mund-, Kiefer- und Gesichtschirurgie |
| Oral and Maxillofacial Surgery | 1997- excepto últimos 12 meses | ProQuest Information and Learning | . | Cambio de: Mund-, Kiefer- und Gesichtschirurgie |
| Oral and Maxillofacial Surgery Cases | 2015- | Clinical Key | . | . |
| Oral and Maxillofacial Surgery Cases | 2015- | Elsevier Science | Gratis | . |
| Oral and Maxillofacial Surgery Clinics of North America | 2002- | Elsevier Science | . | . |
| Oral and Maxillofacial Surgery Clinics of North America | 2007- | Clinical Key | . | . |
| Oral Diseases | 1997- | Wiley Online Library | . | . |
| Oral Diseases | 2003- excepto últimos 12 meses | Ebsco Academic | . | . |
| Oral Health | 2000- | Business Information Group | Gratis | . |
| Oral Health | 2014- | Ebsco Academic | . | . |
| Oral Health | 1996-2011 | ProQuest Information and Learning | . | . |
| Oral Health & Preventive Dentistry | 2003- | Ebsco Academic | . | . |
| Oral Health & Preventive Dentistry | 2003- | Quintessenz Verlags-GmbH | Gratis | . |
| Oral Health 0974 3960 | 2012- | Ebsco Academic | . | . |
| Oral Health and Dental Management | 2002- | Informedica | Gratis | . |
| Oral Health Office | 1997-2011 | ProQuest Information and Learning | . | . |
| Oral Health Office | 2013-2017 | Ebsco Academic | . | . |