Google Scholar
Free search across scholarly articles, theses, books and court opinions, with "cited by" counts and links to full text where available.
- Free plan or free tier
- Shows sources for its answers
Free search of the biomedical and life sciences literature from the U.S. National Library of Medicine, with MeSH indexing.
Not enough info yet on open source, works in Word or Google Docs, shows sources for its answers, mobile app. Check the tool's own site.
Listing written by ResearchBest, checked 2026-11-03. Report a correction or request removal. Back to paper search and indexes.