50 legendary websites that feel like the internet's hidden toolbox: free papers, books, and utilities
nikola_mr64990 · x · 2026-10-27
A widely shared listicle rounds up 50 free websites billed as "the internet's hidden toolbox":
- Academics: free research paper access, plus a backup for papers Unpaywall misses
- Books: a lending site, 70k+ free ebooks, and free audit access to university courses
- Learning: step-by-step math solver
- Images: background removal, object removal, free Photoshop alternative, image compression
- Productivity: PDF merge/split, quick file tools, fast diagrams, beautiful code screenshots
- Dev tools: regex testing, JSON cleanup, terminal tools, and more
No single news angle — it's a bookmark-worthy roundup of long-standing utility sites.
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