oalib.com
Open Access Library helps search books, ebooks, papers, library records, or reading archives.
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openalex.org
Open Alex helps search books, ebooks, papers, library records, or reading archives.
odfinder.github.io
Search tool for finding open directories and publicly browsable file indexes on the web.
openknowledgemaps.org
Open Knowledge Maps helps search books, ebooks, papers, library records, or reading archives.
openlibrary.org
Open Library helps search books, ebooks, papers, library records, or reading archives.
openmedialibrary.com
Open Media Library helps search books, ebooks, papers, library records, or reading archives.
openpaymentsdata.cms.gov
Open Payments helps search books, ebooks, papers, library records, or reading archives.
open-slum.org
Open Slum helps search books, ebooks, papers, library records, or reading archives.
open-slum.pages.dev
Open Slum helps search books, ebooks, papers, library records, or reading archives.
open.umn.edu
Open Textbook Library helps search books, ebooks, papers, library records, or reading archives.
explore.openaire.eu
OpenAire helps search books, ebooks, papers, library records, or reading archives.
opendirsearch.abifog.com
Open directory search engine for finding public folders, file listings, and downloadable content.
v2.sherpa.ac.uk
OpenDOAR helps search books, ebooks, papers, library records, or reading archives.
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.
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.
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.
orionsarm.com
OrionsArm helps search books, ebooks, papers, library records, or reading archives.
osintessentials.com
Curated OSINT toolkit with links for people search, social media, maps, domains, and research.
OSINTMe guide listing public sex offender registries and related search resources by country.
ownersman.com
Ownersman.com helps search books, ebooks, papers, library records, or reading archives.
oyez.org
Oyez helps search books, ebooks, papers, library records, or reading archives.