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user-inactivated · 2969 days ago · link · · parent · post: Hubski, what stupid, simple, and/or esoteric website has made a difference in your life?
The Common Lisp Hyperspec. It's the ANSI Common Lisp standard, htmlized by hand by one of its editors. The Online Encyclopedia of Integer Sequences is really handy if you have a few terms of a sequence from some problem, don't recognize it, and want to see what's known about it. Discogs.com knows all.