✓
Tool
Category
Pricing
Free?
Updated
Label Studio
AI Research
Freemium
✓
Mar 2026
→
Open-source multi-format data labeling platform for ML with configurable interfaces.
Best for: annotation
CORE
AI Research
Free
✓
Mar 2026
→
World's largest open access paper aggregator with 250M+ records and text mining API.
Best for: open-access
Litmaps
AI Research
Freemium
✓
Mar 2026
→
Interactive citation maps showing research evolution over time with monitoring alerts.
Best for: research
Unpaywall
AI Research
Free
✓
Mar 2026
→
Free browser extension that finds legal open access versions of paywalled papers.
Best for: open-access
Kopernio
AI Research
Free
✓
Mar 2026
→
Clarivate browser extension for one-click PDF access to research papers via library links.
Best for: browser-extension
Showing 5 of 55 tools — page 2 of 2