Connected Papers
A visual map of a research field — find the papers around the one you already know.
Tier 3 ToolsFreemium
Research Database Directory
Every research database, reviewed.
ResearchGate
The academic social network where researchers share papers — and their metrics.
Tier 3 ToolsFree
HathiTrust
A massive digital library of scanned books — the scholarly record, digitized.
Tier 3 Open AccessFreemium