Sublime Text 2 plugin for running ruby tests! (Unit, RSpec, Cucumber)
https://github.com/maltize/sublime-text-2-ruby-tests
A full-featured package manager http://wbond.net/sublime_packages/package_control
Easy and fast navigation between code definition https://github.com/SublimeText/CTags
Detect the syntax of files that might not be detected properly (detects rails files which allows to use proper and powerful snippets) https://github.com/phillipkoebbe/DetectSyntax
Plugin for some git integration into sublime text 2 https://github.com/kemayo/sublime-text-2-git
TextMate Style ERB Block for Sublime Text(<%= %>, <% %>..) https://github.com/eddorre/SublimeERB
Sublime Text 2 Ruby on Rails Related Files(allows you to easily navigate your Rails projects) https://github.com/luqman/SublimeText2RailsRelatedFiles
Clipboard history plugin for Sublime Text 2 https://github.com/kemayo/sublime-text-2-clipboard-history
Cucumber syntax & snippets https://github.com/drewda/cucumber-sublime2-bundle
Sublime Text 2 plugin to go to documentation (A command to jump to documentation for the current word) https://github.com/kemayo/sublime-text-2-goto-documentation
Quick File Creator plugin for Sublime Text 2 (Plugin that lets you quickly create a file or a subdirectory using ST2's fuzzy matching feature) https://github.com/noklesta/SublimeQuickFileCreator
Zen Coding support for Sublime Text 2 (http://code.google.com/p/zen-coding/) https://bitbucket.org/sublimator/sublime-2-zencoding
i use SublimeLinter a lot, i don't know if this is already included in Sublime Text 2 nowadays: https://github.com/SublimeLinter/SublimeLinter
when writing a lot of documentation, there is also the Markdown Preview plugin: https://github.com/revolunet/sublimetext-markdown-preview
and there is also the Color Picker https://github.com/weslly/ColorPicker