###Bash
* [Learn Shell Programming](http://www.learnshell.org)


###C
* [Learn C](http://www.learn-c.org/)


###C#
* [Learn C#](http://www.learncs.org/)


###Clojure
* [Clojure Koans](http://clojurekoans.com/)
* [ClojureScript Koans](http://clojurescriptkoans.com/)
* [Try Clojure](http://tryclj.com/)


###CoffeeScript
* [Smooth CoffeeScript, Interactive Edition](http://autotelicum.github.io/Smooth-CoffeeScript/interactive/interactive-coffeescript.html)


###Erlang
* [Try Erlang](http://www.tryerlang.org/)


###Git
* [Githug](https://github.com/Gazler/githug) (Tutorial in shell)
* [Learn Git Branching](http://pcottle.github.io/learnGitBranching/)
* [Try Git](http://try.github.io)


###Go
* [The Go Tutorial](http://golang.org/doc/go_tutorial.html)


###Haskell
* [Try Haskell!](http://tryhaskell.org/)


###Java
* [Learn Java](http://www.learnjavaonline.org/)


###Javascript
* [Learning Advanced JavaScript](http://ejohn.org/apps/learn/)
* [Learn JavaScript](http://www.learn-js.org/)
* [Learn knockout.js](http://learn.knockoutjs.com)
* [Try jQuery](http://try.jquery.com/)


###Lisp
* [Lisp Koans](https://github.com/google/lisp-koans)


###MATLAB
* [Interactive Tutorials for MATLAB, Simulink, Signal Processing, Controls, and Computational Mathematics](http://www.mathworks.com/tutorials)


###NoSQL
* [MongoDB Koans](https://github.com/chicagoruby/MongoDB_Koans)
* [Try Redis](http://try.redis.io/)


###Objective-C
* [Try Objective-C](http://tryobjectivec.codeschool.com)


###Ocaml
* [Try Ocaml](http://try.ocamlpro.com/)


###Perl
* [Perltuts.com](http://perltuts.com)


###PHP
* [Learn PHP](http://www.learn-php.org/)


###Python
* [How to Think Like a Computer Scientist: Learning with Python, Interactive Edition](http://interactivepython.org/courselib/static/thinkcspy/index.html)
* [Learn Python](http://www.learnpython.org/)
* [Python Koans](https://github.com/gregmalcolm/python_koans)


###R
* [Try R](http://tryr.codeschool.com)


###Ruby
* [RubyMonk - Interactive Ruby tutorials](http://rubymonk.com)
* [CodeCademy Ruby](http://www.codecademy.com/tracks/ruby)
* [Try Ruby](http://tryruby.org/)
* [Ruby Koans](http://www.rubykoans.com/)


###Scala
* [Scala Tour](http://www.scala-tour.com/)


###Vim
* [Interactive Vim Tutorial](http://www.openvim.com/tutorial.html)