Epoxy is a library for handling OpenGL function pointer management for you
Searchlogic provides object based searching, common named scopes, and other useful named scope tools.
a data munging and reporting library for Ruby
Mysqldump, writing in postgresql format
A fist full of code metrics
acts_as_audited is an ActiveRecord extension that logs all changes to your models in an audits table.
Rack middleware to force SSL
Easy file attachment management for ActiveRecord
Ruby interface to HTML Tidy Library Project (http://tidy.sf.net)
middleware for posting exceptions to http://hoptoadapp.com