SciSpace
Read, chat with, and understand papers — an AI copilot for the PDF.
Tier 3 ToolsFreemium
Research Database Directory
Every research database, reviewed.
DOAB
The Directory of Open Access Books — DOAJ's counterpart for scholarly monographs.
Tier 3 Open AccessFree
LILACS
Latin American and Caribbean health literature — the regional index PubMed misses.
Tier 3 Open AccessFree
PubMed Central (PMC)
The free full-text archive behind PubMed — biomedical papers you can actually read.
Tier 2 Open AccessFree
Google Dataset Search
Google for datasets — one search box across millions of data repositories.
Tier 2 ToolsFree
DataCite
DOIs for data — the identifier registry that makes datasets citable.
Tier 3 ToolsFree
Sciety
Preprint evaluations in one place — see which preprints experts have vetted.
Tier 3 ToolsFree
Fatcat
The Internet Archive's open catalog of scholarship — the editable backbone under IA Scholar.
Tier 3 Open AccessFree
Citavi
Reference management plus knowledge organization — think, then write.
Tier 3 ToolsFreemium
Open Science Framework (OSF)
The open-science workbench — manage a project, preregister, and share it all.
Tier 2 ToolsFree