Gil's LotD

http://ipsur.org/ An introductory textbook to statistics and the R programming language.

http://atgreen.github.com/ggx/ A step-by-step guide to adding support to the GNU toolchain for a new architecture.

https://github.com/mirrors/perl/blob/book/perlsecret/pod/perlsecret.pod Perl's list of secret operators.

http://me.veekun.com/blog/2012/04/09/php-a-fractal-of-bad-design/ A comprehensive collection of criticisms of the PHP language and its standard library.

http://www.slate.com/articles/technology/technology/2012/03/ruby_ruby_on_rails_and__why_the_disappearance_of_one_of_the_world_s_most_beloved_computer_programmers_.single.html A comprehensive history of Why the Lucky Stiff, the king of Internet hipsters.

http://www.lurklurk.org/linkers/linkers.html This is a pretty comprehensive introduction to linking in C and C++.

http://lambda.bugyo.tk/cdr/mwl/ A Japanese manga guide to the programming language Lisp.

http://doryen.eptalys.net/libtcod/ libtcod is a library for writing Roguelike games.

http://www.blue.sky.or.jp/grass/ Grass is a programming language that consists of only the letters v, w, and W.

http://en.wikipedia.org/wiki/Fj%C3%B6lnir_programming_language The Fjölnir programming language.

http://ejohn.org/blog/processingjs/ A port of the Processing language to web browsers.

http://www.xbox-linux.org/wiki/17_Mistakes_Microsoft_Made_in_the_Xbox_Security_System This is an incredibly comprehensive article detailing the architecture and security mistakes in the original Xbox. Because of these oversights people were able to mod the Xbox. This article is a must read.

http://magazine.redhat.com/2008/02/07/python-for-bash-scripters-a-well-kept-secret/ Using Python's subprocess module to write shell scripts in Python.

http://lolcode.com/home LOLCODE, the LOLcat programming language.

http://www.csse.monash.edu.au/~damian/papers/HTML/Perligata.html Write Perl in Latin!