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onyphe.io
OSINT search engine for exposed assets, IPs, domains, certificates, and network data.
ooni.org
Network test that checks whether Tor access appears blocked and contributes measurement data.
opac.pnm.gov.my
Research index for locating articles, books, authors and citation information.
archives.kdemo.or.kr
Archives of the Democratization Movement Memorial Foundation.
orka.bibliothek.uni-kassel.de
Digital library for searching books, documents, images and online collections.
huggingface.co
Open VLM Leaderboard supports machine learning models, deployment, inspection, datasets, or AI development workflows.
github.com
Official repository for Open Web Analytics which is an open source alternative to commercial tools such as Google Analytics. Stay in control of the data you collect about the use of your website or app. Please consider sponsoring this project.
openaire.eu
Network of Open Access repositories, archives and journals that support Open Access policies.
openbenches.org
Website documenting commemorative benches.
opendesk.cc
Virtual furniture shop with downloadable design files.
openml.org
OpenML supports machine learning models, deployment, inspection, datasets, or AI development workflows.
openmlol.it
Browse digitized texts, images, archives and cataloged cultural materials.
openoversight.com
Public database for identifying law-enforcement officers, agencies, badges, and accountability records.
github.com
Model Context Protocol - An open standard for connecting AI models to external tools and data sources. MCP Registry.
orbi.uliege.be
Institutional repository of the University of Liège.
orcabook.com
Find scholarly literature and bibliographic records using structured search fields.
oregondigital.org
Digital archive portal in Oregon, US.
oregonpoeticvoices.org
Digital archive of poetry readings by Oregon poets.
orfee.hepl.ch
Repository of HEP Vaud, Switzerland.
orto.website
Vehicle lookup site for checking license plates, car data, and public vehicle-related records.
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.