This is not the book you are looking for. Move along. Move along. 😉 (Someday it might be, though!)

Data processing & ETL framework for Ruby

Convert RGB⇄HSL Colors

Fast math typesetting for the web.

Cross-platform Rust rewrite of the GNU coreutils

An extensive math library for JavaScript and Node.js

A command-line power tool for Twitter.

rvm test suite

A voting system with proxies.

Allows you to create bots for turntable.fm

Catches mail and serves it through a dream.

Pittco LAN Administration System

Rails Generators for Cucumber with special support for Capybara and DatabaseCleaner

A simple trivia bot written in perl

Cucumber for Ruby. It's amazing!

A Ruby interface to the Twitter API.