OpenAIRE
Europe's open scholarly graph — publications, data, software, and funding, linked.
Tier 2 Open AccessFree
Research Database Directory
Every research database, reviewed.
Zenodo
CERN's catch-all repository — deposit any research output and get a DOI.
Tier 2 Open AccessFree
figshare
Share figures, datasets, and outputs — repository with a polished front end.
Tier 2 Open AccessFreemium
Dryad
The curated data repository — where research data gets checked before it's shared.
Tier 3 Open AccessFreemium
RePEc / IDEAS
The volunteer-built open bibliography of economics — with IDEAS as its main front door.
Tier 2 Open AccessFree
AGRICOLA
The U.S. National Agricultural Library's free index for agriculture and the food sciences.
Tier 3 Open AccessFree
PhilPapers
The comprehensive, community-curated index and archive of philosophy.
Tier 2 Open AccessFree
SciELO
The open-access library of Latin American, Caribbean, and allied science — free, full-text, multilingual.
Tier 2 Open AccessFree
Redalyc
The open-access index of Ibero-American scholarship — diamond open access at scale.
Tier 2 Open AccessFree
J-STAGE
Japan's national platform for scholarly journals — much of it open, much of it in English.
Tier 2 Open AccessFree