50 useful websites list: free papers, ebooks, and developer tools
nikola_mr64990 · x · 2026-11-12
A curated list of 50 'hidden toolbox' websites covering study, dev, and productivity: free papers and academic search (Sci-Hub, Semantic Scholar, Connected Papers), ebooks and textbooks (LibGen, Gutenberg), image/PDF tools (Photopea, remove.bg, squoosh, Smallpdf), developer helpers (regex101, explainshell, ray.so), and security utilities (haveibeenpwned, VirusTotal, temp-mail).
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