RubyMine 7.1 (Mac OS X) | 185 MB RubyMine is a full-fledged Ruby on Rails...
Key features include:
Intelligent Editor: code completion, code snippets and automatic refactorings
Project Navigation: wide range of views and one-click jumping between components
Error-Free Coding: on-the-fly code analysis and type inference
Web Development with Ruby on Rails (including best-of-breed HTML, CSS and javascript editing support)
RSpec, Cucumber and Test::Unit support,...