PLEIADI - Portale per la Letteratura scientifica Elettronica Italiana su Archivi aperti e Depositi Istituzionali
OAIster – Union catalog of digital resources
OpenDOAR – Directory of Open Access Repositories
ROAR – Registry of Open Access Repositories
Archivi italiani OAI
ArXiv
Biblioteca Italiana (BibIt)
BioMed Central – The Open Access Publisher
CERN Document Server (CDS)
Cogprint – Cognitive Science Eprint Archive
DART-Europe E-theses Portal
DOAB - Directory of Open Access Books
DOAJ - Directory of Open Access Journals
DSpace MIT – Institutional Repository of Massachusetts Institute of Technology
E-LIS – E-prints in Library and Information Science
Free Medical Journals
JEP – The Journal of Electronic Publishing
NUMDAM – Numérisation de documents anciens mathématiques
OpenGrey Repository - System for Information on Grey Literature in Europe
Open Knowledge Repository - World Bank
PLoS – Public Library of Science
PubMed Central
ROAD - Directory of Open Access Scholarly Resources