For developers, who are building real-time data-driven applications, Redis is the preferred, fastest, and most feature-rich cache, data structure server, and document and vector query engine.

Nokogiri (鋸) makes it easy and painless to work with XML and HTML from Ruby.

The Rubinius Language Platform

A Ruby gem for memory profiling

Thread#backtrace for ruby 1.8

X-Chat Aqua for Mac OS X

Complete (unofficial) history of nginx releases