Engage! is a Rails gem that adds a user support forum to your Rails application.
Simple to use
Your users can easily report bugs, ask questions, and submit praise. They can vote for ideas they like and comment on the ideas of others. Single sign on means they don't leave your site or require a new account just to tell you what's on their minds.
Easy to install
As simple to install as a Rails gem. Engage can be linked to your existing authentication system or you can use the built-in authentication. Be up and running in minutes or tweak to your heart's content.
User engagement without limits
Because you own the rights to the code and host the app yourself, you can extend it, skin it, and add as many administrators as you like at no additional per-user charge. Customize text, styles, icons to create just the experience you want your users to have.