The Internet nowadays is an infinite source of information. It is our duty to shape/filter this information in a way that anyone at any given time knows where to search for the information that is needed.
If there is no thread similar to this, I would like to start a collection of useful links that points to free books on programming, good tools and general knowledge about development.
If there is anything missing (which is likely), just post the link and I'll copy it into this list.
Free books on programming and related topics
Huge collections of Information / free books:
programming-motherfucker.com
github.com/vhf/free-programming-books
devdocs.io
Linux
10 useful free linux ebooks
5 downloadable books to teach yourself linux
Tutorials
HTML
htmldog.com
OpenGL
opengl.org/wiki/Getting_Started
open.gl
github.com/adjestic/Haskell-OpenGL-Tutorial
Misc
Arm Assembler on Raspberry Pi, thinkingeek.com
Simple git guide
IDEs and Editors
Eclipse
VIM
Emacs
Texmaker - great LaTeX editor
Sharing Code
It is good practice to post short code snippets in a codeblock and link to larger snippets via:
pastie.org
paste.ofcode.org
dpaste.com
Repositories
git
github.com
gitlab.com - hosting your own GIT repositories
Mathematics
Misc
detexify - draw a symbol and get the corresponding LaTeX code
cronmaker - cron expression generator
vim shortcut wallpaper