JetBrains RubyMine v4.0.3

JetBrains RubyMine — Ruby and Rails IDE with the full stack of essential developer tools, all tightly integrated into a convenient and smart environment for Ruby programming and Web development with Ruby on Rails.
The main focus of RubyMine 4 is performance. At the same time the new release brings improvements to all aspects of your collaboration with IDE. Take a look on the most considerable changes of the forthcoming release.

Intelligent Ruby Editor with completion, code snippets and automatic refactorings
On-the-fly code analysis throughout the project tree with type inference and quick-fixes
Rails Models Diagram, Rails Project View and other specialized project/file views for faster overview & navigation
RSpec, Cucumber, Shoulda, MiniTest & Test::Unit coding assistance and GUI-based test runner

Web Development with all Ruby on Rails framework versions from 2.x to 3.x
Cutting-edge Ruby development stack support: Bundler, RVM, etc.
HTML, CSS and javascript editing with auto completion and refactorings. Plus CoffeeScript, HAML, SASS, and LESS
Zen coding snippets for productive HTML/CSS authoring
javascript debugger based on Mozilla Firefox and Google Chrome

Ruby Debugger: Ruby/Rails applications and tests debugging in a easy-to-use interface even in Windows
Git, Subversion, Mercurial, Perforce and CVS integration with a unified UI
Diff, merge, history views and changelists for every supported VCS
Bundled Textmate, NetBeans, Eclipse & Emacs keyboard schemes, plus Vi/Vim emulation plugin
Runs on Windows, Mac OS X or Linux