Introspect the Ruby Heap by indexing, counting, locating references to and detaching (in order to release) objects - optionally narrowing by namespace
A Ruby natural language processor.
Writing Fast Ruby -- Collect Common Ruby idioms.
A Scope & Engine based, clean, powerful, customizable and sophisticated paginator for Ruby webapps
Simple, powerful, first-party analytics for Rails
Goliath API for asynchronously gathering URL counts from various social networks