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RubyMine

JetBrains RubyMine — Ruby and Rails IDE built on years proven IntelliJ platform. RubyMine brings the whole range of essential developers tools, all tightly integrated together for creating the convenient development environment for productive Ruby development and Web development with Ruby on Rails. $99 to buy, free 30-day trial, free for educational institutions and trainers, and Open Source projects.

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, with GUI-based test runner

Ruby Debugger: full support for Rails applications debugging and easy-to-use interface

VCS Integrations: Git, Perforce, Subversion and CVS with changelists and merge Open API and Plugin Development SDK, ensuring IDE extensibility and flexibility