Astrotrain is the only other ruby project I know of: http://github.com/technoweenie/astrotrain http://github.com/technoweenie/astrotrain Mailman is very lightw

Astrotrain is the only other ruby project I know of: http://github.com/technoweenie/astrotrain http://github.com/technoweenie/astrotrain Mailman is very lightweight, has Rails integration, and doesn't require a database to store routes (Astrotrain does). Instead, it uses a Sinatra-like DSL to define routes and conditions. Gmail accounts can be handled using a MDA like getmail and the built-in maildir support in Mailman. Mailman works fully with 1.8.6, 1.8.7, 1.9.1, 1.9.2, REE and JRuby.