Aptana RadRails (Beta with RadRails and Ruby )

Aptana RadRails Beta with RadRails and Ruby Development Tools (RDT)

Aptana RadRails is an integrated development environment for the Ruby on Rails framework.
Web Features
Free and open source; cross-platform, stand-alone IDE or Eclipse plug-in
File- and project-based workflow with integrated FTP/SFTP
Real-time, Wiki-based online help; IDE translated into multiple languages
Scriptable using JavaScript (“Aptana Monkey”)
Backed by full-time developers; nearing a million combined downloads
Deep support (including cross-browser tips) for JavaScript, HTML, CSS
Syntax highlighting, auto completion, code assist, error reporting, etc.
Full support for JavaScript and CSS embedded within HTML; unified outlining
Works with any JavaScript, incl. all Ajax libraries
JavaScript debugger with live Firebug integration
Rails Features
Unified, deep support for Ruby, Rails, RHTML…and JS, HTML, CSS!
Syntax highlighting, auto completion, code assist, error reporting, outlining, etc.
Ruby code generation: constructors, overrides, templates, accessors
Refactoring: local to instance variables, extract methods, inlining, renaming…
Fast, integrated debugger
Support for Rails generators, Rake, plugins, and server management
View unit tests and test results
Integrated code analysis
Embedded database navigator and query console
Snippets and wizards
Integrated help, including “Go to definition”, RDoc/RI, and code explorer

Reference http://www.radrails.org/download_rails_rdt.php