v2.sherpa.ac.uk
OpenDOAR helps search books, ebooks, papers, library records, or reading archives.
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open.bccampus.ca
OpenED helps search books, ebooks, papers, library records, or reading archives.
openedition.org
OpenEdition helps search books, ebooks, papers, library records, or reading archives.
github.com
Openlibrary is a code project with source, releases, documentation, or setup notes.
openlinkprofiler.org
OpenLinkProfiler is a web tool for finding, checking, or analyzing online information related to domains, networks, and digital services.
openmaktaba.com
OpenMaktaba helps search books, ebooks, papers, library records, or reading archives.
openmd.com
OpenMD helps search books, ebooks, papers, library records, or reading archives.
openmlol.it
Browse digitized texts, images, archives and cataloged cultural materials.
openstax.org
Openstax helps search books, ebooks, papers, library records, or reading archives.
philschatz.com
OpenStax College Textbooks helps search books, ebooks, papers, library records, or reading archives.
optimism.io
Optimism Blog covers crypto news, blockchain markets, Web3 projects, and digital asset industry updates.
orbi.uliege.be
Institutional repository of the University of Liège.
orfee.hepl.ch
Repository of HEP Vaud, Switzerland.
orionsarm.com
OrionsArm helps search books, ebooks, papers, library records, or reading archives.
osaka-aoyama.repo.nii.ac.jp
Search an online collection of books, documents, media and archival records.
ogu.repo.nii.ac.jp
Browse digitized texts, images, archives and cataloged cultural materials.
lib.osaka-kyoiku.ac.jp
Search an online collection of books, documents, media and archival records.
ir.library.osaka-u.ac.jp
Search an online collection of books, documents, media and archival records.
ompu.repo.nii.ac.jp
Browse digitized texts, images, archives and cataloged cultural materials.
one-plus.github.io
OSINT Toolkit is an online tool that helps users work with usernames, digital identities, or related information for research and testing.
otemae.repo.nii.ac.jp
Search an online collection of books, documents, media and archival records.
ourarchive.otago.ac.nz
Open research repository at Otago University in New Zealand.
ows.lib.polyu.edu.hk
The Outstanding Work by Students project at The Hong Kong Polytechnic University.
ownersman.com
Ownersman.com helps search books, ebooks, papers, library records, or reading archives.