A Resque plugin for ensuring only one instance of your job is running at a time.
The Toto site for DevOpsCasts
Effing package managers! Build packages for multiple platforms (deb, rpm, etc) with great ease and sanity.
A port of Netflix's Archaius to Ruby
Two or more jobs with the same lock cannot be processed simultaneously by multiple workers.
Metamarkets Druid Data Store
Cube: A system for time series visualization.
Rack-based interactive console (à la Rails console) for your web application's front-end
Installs and configures rbenv
A Cube client for Ruby (http://square.github.com/cube).
A very primitive tool for doing legal documents by converting markdown to pdf.
Merlin team's hubot
Foundation is awesome, now it's easy to use with Rails
Simple daemon for easy stats aggregation
A simple recipe for packaging Redis 2.4.0 rc8 as an RPM for CentOS.
Advanced seed data handling for Rails, combining the best practices of several methods together.
Devise Module for LDAP
A realtime web server that doesn't suck
ActiveRecord adapter for JDBC and JRuby.
An irc bot framework
Helpful stuffs for Heroku.
A Ruby wrapper for the OAuth 2.0 protocol.