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http://sean.wenzel.net/docs/emacs/quick_reference/

Emacs Quick Reference to Keyboard Shortcuts and Key Bindings - Sean Wenzel

Notation It is important to understand the notation commonly used in Emacs documentation. Most of the commands used in Emacs consist of a modifier key, in conjuction with one or more other keys. The following are the common modifier keys: The CONTROL key. Depending upon the terminal this is the ALT key.
Maven

Markdown Syntax Documentation

Note: This document is itself written using Markdown; you can see the source for it by adding ‘.text’ to the URL . Overview Philosophy Markdown is intended to be as easy-to-read and easy-to-write as is feasible. Readability, however, is emphasized above all else. A Markdown-formatted document should be publishable as-is, as plain text, without looking like it’s been marked up with tags or formatting instructions. http://daringfireball.net/projects/markdown/syntax#p
http://www.datamation.com/osrc/article.php/12068_3905421_4/60-Great-Open-Source-Developer-Tools.htm

60 Great Open Source Developer Tools — Datamation.com

Open Source Version Control 46. Bazaar Sponsored by Canonical and part of the GNU project, Bazaar offers distributed version control.