Lrn2Code

Python

 * Learn Python the Hard Way
 * Learn Python in Y Minutes
 * Udacity

C/C++

 * Learn C the Hard Way
 * Stanford Engineering Everywhere

Java

 * Udacity

Haskell

 * Learn You a Haskell
 * Try Haskell

LaTeX

 * Josef !!nUf2NflSAyw
 * Reference Wikibook