Gem for managing multiple analytics services in your rails app.
Ruby wrapper to the Google AJAX API REST interfaces(Feeds, Language and Search).
A Ruby/Rails job server and scheduler
Clean and simple integration of the Apple standard XML format, PList into ActiveRecord and as a mime-type for API integration.
The presenter library you already know.
Fork of acts_as_state_machine with transition logging
Treat an ActiveRecord model as a file attachment, storing its patch, size, content type, etc.
Cruise Control for Ruby, keep it simple
Test App for FunnelCake
An awesome replacement for acts_as_nested_set and better_nested_set.