Open Access Search Engines

• BASE: Bielefeld Academic Search Engine http://www.base-search.net
• CiteSeerX http://citeseerx.ist.psu.edu
• Core: Connecting Repositories http://core.kmi.open.ac.uk/search
• Google Scholar http://scholar.google.co.in
• Microsoft Academic Search http://academic.research.microsoft.com
• OAIster (WorldCat) http://oaister.worldcat.org
• OAJSE http://www.oajse.com
• JURN http://www.jurn.org

Open Access Books / Publishing Directories

• Directory of Open Access Books (DOAB) http://doabooks.org
• Directory of Open Access Journals (DOAJ) http://www.doaj.org
• Institutional Archives Registry http://roar.eprints.org
• Open Access Directory http://oad.simmons.edu/oadwiki/Main_Page
• DOAR http://www.opendoar.org
• ROAR http://roarmap.eprints.org
• ROAD http://road.issn.org

Open Access E-books

• Alex Catalogue of Electronic Texts http://infomotions.com/alex
• Amedeo Challenge http://www.amedeochallenge.com/
• Authorama http://www.authorama.com/
• Bartleby http://www.bartleby.com/
• DOAB: Directory of Open Access Books http://doabooks.org/
• eBooks@Adelaide https://ebooks.adelaide.edu.au/
• OAPEN http://www.oapen.org/home
• Open Library https://openlibrary.org/
• InTech Open Books http://www.intechopen.com/books
• Project Gutenberg http://www.gutenberg.org/
• Read Print http://www.readprint.com/
• Rare Book Room http://www.rarebookroom.org/
• The American School of Classical Studies at Athens (ASCSA) http://www.ascsa.edu.gr/index.php/publications/open-access-ebooks
• The Universal Digital Library Million Book Collection http://ulib.isri.cmu.edu/

Indian Open Access Journals

• CSIR-NISCAIR Journals http://www.niscair.res.in/periodicals/researchjournals
• Indian Academy of Science http://www.ias.ac.in/Journals/Overview
• Medknow Journals http://www.medknow.com

Open Access Journal Publishers

• Biomed Central http://www.biomedcentral.com/
• Computational Psychiatry http://computationalpsychiatry.org/
• Intech http://www.intechopen.com/
• Journal Springer Open http://journal.chemistrycentral.com/
• Network Neuroscience http://www.mitpressjournals.org/netn
• Open Mind http://open-mind.net/
• PLoS http://www.plos.org/
• PeerJ https://peerj.com/

Open Textbook Projects / Portals

• OpenStax https://openstax.org/
• Open Textbook Library https://open.umn.edu/opentextbooks
• Open SUNY Textbooks https://milneopentextbooks.org/
• MIT OpenCourseWare: Online Textbooks https://ocw.mit.edu/courses/onlinetextbooks/
• Luminos (University of California Press) https://www.luminosoa.org/
• BCcampus: Open Textbook Collection https://open.bccampus.ca/browse-ourcollection/find-open-textbooks/
• eCampusOntario Open Library https://openlibrary.ecampusontario.ca/
• Merlot https://www.merlot.org/merlot/
• UCL Press Open Access Books https://www.uclpress.co.uk/collections/open-access
• Open Book Publishers https://www.openbookpublishers.com/
• Open Textbook Initiative (Australia) https://emedia.rmit.edu.au/oer/
• LibreTexts: Free the Textbook https://libretexts.org/
• 200 Free Textbooks: A Meta Collection https://www.openculture.com/free_textbooks
• IntechOpen https://www.intechopen.com/
• MIT OpenCourseWare https://ocw.mit.edu/index.htm
• Saylor https://www.saylor.org/
• GALILEO Open Learning Materials https://oer.galileo.usg.edu/all-textbooks/
• NOBA https://nobaproject.com/

Massive Open Online Courses

• https://www.mooc-list.com
• Open Online Education https://edu.google.com/openonline/index.html
• Purdue OWL https://owl.english.purdue.edu/owl
• Queensland University of Technology https://www.qut.edu.au/study/open-online-learning
• Udemy https://www.udemy.com

Virtual Libraries / Subject Gateways

• Hathi Trust Digital Library https://www.hathitrust.org/
• Infoport http://infoport.inflibnet.ac.in
• Internet Public Library http://www.ipl.org
• Intute http://www.intute.ac.uk/
• Social Science Cyber Library http://www.socsccybraryamu.ac.in/index.php/users-component/subject-gateways
• Vifamath: the Virtual Library of Mathematics http://vifamath.de/
• WWW Virtual Library http://vlib.org/
• WorldWideScience.org https://worldwidescience.org/

Open Access Video Lectures

• Academic Earth http://academicearth.org/
• Bioinformatics Centre of BTISnet https://sites.google.com/a/sgbau.ac.in/bioinformatics-centre-of-btisnet/open-access-videolectures
• Engineering Tube http://engineeringtube.net/
• Free Lecture Videos http://www.freelecturevideos.com/
• Free Science Videos and Lectures http://www.freesciencelectures.com/
• Open Yale Courses http://oyc.yale.edu/
• Video Lecture https://videolectures.net/

Open Education Courseware

• Carnegie Mellon http://oli.cmu.edu/learn-with-oli/see-our-free-open-courses
• Johns Hopkins OpenCourseWare http://ocw.jhsph.edu/
• MIT OpenCourseWare (OCW) http://ocw.mit.edu/
• Notre Dame http://ocw.nd.edu/
• NPTEL http://nptel.ac.in/
• OpenMichigan http://open.umich.edu/education
• Open Yale Courses http://oyc.yale.edu/courses
• Oxford Mathematics OpenCourseWare https://courses-archive.maths.ox.ac.uk/

Open Online Learning Tools

• Codecademy http://www.codecademy.com/
• Coursera https://www.coursera.org
• Duolingo https://www.duolingo.com
• EdX https://www.edx.org/
• EduTopia https://www.edutopia.org/blog/googles-open-course-builder-todd-finley
• Khan Academy https://www.khanacademy.org/

Open Access Standard Sources

• ECMA International Open Standards http://www.ecma-international.org/publications/standards/Standard.htm
• OASIS Open Standards https://www.oasis-open.org/standards
• Open Geospatial Consortium http://www.opengeospatial.org/standards/is
• World Wide Web Consortium Open Standard http://open-stand.org

Open Access Patent Sources

• AusPat http://pericles.ipaustralia.gov.au/ols/auspat/quickSearch.do
• Esp@cenet http://ep.espacenet.com/
• Indian Patent Office http://ipindiaservices.gov.in/publicsearch
• US Patent and Trademark Office (PTO) http://patft.uspto.gov/

Open Access ETD Sources

• Australian National Library / Trove — Theses & Dissertations http://trove.nla.gov.au/result?q=+&lformat=Thesis
• DiVA Portal http://www.diva-portal.org/smash/search.jsf
• NDTLD http://www.ndltd.org

Open Access Theses and Dissertations

• OATD http://oatd.org/
• PQDT OPEN: ProQuest Digital Theses http://pqdtopen.proquest.com/
• ShodhGanga, India http://shodhganga.inflibnet.ac.in/
• Theses Canada http://www.collectionscanada.gc.ca/thesescanada/index-e.html

Archives

• ArXiv.org http://arxiv.org/
• CERN Document Server http://cds.cern.ch/
• Cogprints http://cogprints.org/
• Cryptology ePrint Archive https://eprint.iacr.org/
• Eprint Network http://www.osti.gov/eprints
• HAL-SHS Archive https://halshs.archives-ouvertes.fr/search/index
• HAL Open Archive Scholarly Documents https://hal.archives-ouvertes.fr/search/index
• Institut Nicod Eprints Archive http://jeannicod.ccsd.cnrs.fr/search
• MédiHal Open Archive of Scientific Images https://medihal.archives-ouvertes.fr
• Organic Eprints http://orgprints.org/
• RePEc (Research Papers in Economics) http://repec.org/
• Solar Physics E-Print Archive http://solar.physics.montana.edu/cgibin/eprint/default_page.html

Consortium of Open Courseware (OCW)

• GUIDE – Global Universities in Distance Education http://www.guideassociation.org/
• ISSUU: Open Course Ware Consortium http://issuu.com/ocwconsortium
• OCW Consortium Europe http://www.opencourseware.eu/
• OCW Universia Consortium https://www.oeconsortium.org/members/view/215/
• Social Science Research Network https://www.ssrn.com/en