brainstellar.com
Brainstellar Puzzles is an educational resource for documentaries, courses, books, reference material, or self-learning.
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chiark.greenend.org.uk
Simon Tatham's Puzzles helps search books, ebooks, papers, library records, or reading archives.
github.com
Simon Tatham's Puzzles is a code project with source, releases, documentation, or setup notes.