A minimalist queueing DSL for Beanstalk.

Wolfram|Alpha client

Website load testing tool in Ruby, with the ability to "unload a busload of tourists" on a website, each with the ability to trace through complex application paths.

A command line tool that analyzes request logfiles (e.g. Rails, Merb, Apache) to produce a performance report.

An extendable Ruby on Rails 'CMS framework' that supports Rails 3

Database Sharding for ActiveRecord

A new look and feel for Test::Unit output -- Test::Unit Reporter (New)

A Ruby Gem that gives you full access to several of the Amazon Web Services API from your Ruby/Ruby on Rails apps

Ruby Interface for the OpenLibrary API

A generic, language-neutral framework for extending Ruby objects with linguistic methods.