Here are a few of the projects that have come from members of our group:
A lightweight rails plugin that logs impressions per action or manually per model.
A rails engine that provides very basic social functionality that you can attach to any model, including comments, ratings, voting, favorites, user reputation, and friend relations.
Gem for managing authorization on model actions in Rails
YAML settings for your rails 3 app.
A plugin to display upcoming meetup.com events in the sidebar of an Octopress blog.
Simple utility that pulls image URLS from web page