In 2007 ActiveState released most of the code of its flagship Komodo IDE product under a MPL (Mozilla Public License)/GPL dual license. This has a huge impact for Ruby and Rails developers. Komodo has had advanced support for Ruby since 2004, including smart auto-indenting and code-completion. Since early 2007, it's also had deep integration with Rails projects, including project and file management; debugging controllers, views, and tests; and Rails-aware code-completion.

This talk will cover the various tools Komodo offers for building, debugging, testing, and deploying Rails applications. In addition, we'll show how to take advantage of Komodo's Mozilla underpinnings to build extensions, give a high-level tour of the codebase, and discuss some of the directions people are taking the codebase in.