PubMed
The free, authoritative front end to the world's biomedical literature.
Tier 2 Open AccessFree
Research Database Directory
Every research database, reviewed.
arXiv
The original preprint server — open science before the term existed.
Tier 2 Open AccessFree
bioRxiv / medRxiv
The preprint servers that moved the life and health sciences to publish-first.
Tier 2 Open AccessFree
DOAJ
The vetted directory of trustworthy open-access journals — the antidote to predatory publishing.
Tier 2 Open AccessFree
Semantic Scholar
The AI-native index that reads papers so you don't have to read all of them.
Tier 2 Open AccessFree