Interesting links to mainly programming or other fascinating topics:
Paper on creating a Rubik-like puzzle from any object:
http://www.cs.columbia.edu/cg/twisty/twisty.pdf
incredible wood carving
http://www.emptykingdom.com/featured/randall-rosenthals-wood/
How to do everything
http://www.wikihow.com
i3 reference card
https://i3wm.org/docs/refcard.html
unofficial windows binaries for python extension packages:
http://www.lfd.uci.edu/~gohlke/pythonlibs/#pycairo
Fun stuff
http://rebrn.com/sub/oddlysatisfying/
Programming
Modern OpenGL => https://github.com/totex/PyOpenGL_tutorials/
Pygame + OpenGL => https://pythonprogramming.net/opengl-pyopengl-python-pygame-tutorial/
Autohotkey => http://ahkscript.org
Super Mario Bros in Python (Pygame) => https://github.com/justinmeister/Mario-Level-1
Python and music => https://wiki.python.org/moin/PythonInMusic
Computer simulations =>http://panoramix.ift.uni.wroc.pl/~maq/eng/index.php
Cool ways to create audio using codehttp://audiocookbook.org/
Cool Mathematica programs => http://bugman123.com/index.html
Advanced fluid dynamics using the level set method
Physics simulation => http://physbam.stanford.edu/~fedkiw/
Physics simulations => http://www.falstad.com/
Undocumented Matlab => http://undocumentedmatlab.com/
Puzzles
Japanese Puzzle box => http://puzzling-parts.thejuggler.net/
Wire puzzles => https://www.puzzlemaster.ca/browse/wire/