Ai2 Asta
Open agentic literature search from the lab behind Semantic Scholar.
Tier 2 Open AccessFree
Research Database Directory
Every research database, reviewed.
ASReview
Open-source active learning that reorders your screening pile as you work.
Tier 2 ToolsFree
OpenCitations
Citation data as public infrastructure — CC0, queryable, no licence required.
Tier 2 Open AccessFree
CiteSpace
Detect the turning points in a field — citation analysis with a temporal lens.
Tier 3 ToolsFree
Bibliometrix
Bibliometric analysis in R — reproducible science mapping, code-first.
Tier 3 ToolsFree
Publish or Perish
Citation metrics on demand — pull an author or topic's impact in seconds.
Tier 3 ToolsFree
Scilit
A fast, free scholarly index — MDPI's comprehensive metadata search.
Tier 3 Open AccessFree
JabRef
The open-source BibTeX manager — a LaTeX writer's reference home.
Tier 3 ToolsFree
VOSviewer
The bibliometric map-maker — turn citation data into readable networks.
Tier 2 ToolsFree
LILACS
Latin American and Caribbean health literature — the regional index PubMed misses.
Tier 3 Open AccessFree