http://www.mikeperham.com/2010/04/28/bayes_motel-bayesian-classification-for-ruby/

BigSitemap is a Sitemapgenerator suitable for applications with greater than 50,000 URLs. It splits large Sitemaps into multiple files, gzips the files to minimize bandwidth usage, batches database queries to minimize memory usage, supports increment updates, can be set up with just a few lines of code and is compatible with just about any framework.

An awesome, flexible, powerful, useful, tricky and liar Rails 3 recommendations engine.

This ensures that devise will update a last_seen flag on the model whenever you check if a user is authed.

Ruby API Client for FederalRegister.gov that handles searching documents and getting information about agencies

An EventMachine based S3 client

Parallel Each and other parallel things

Flexible querystring generator

A simple wrapper for SODA 2.0. Includes an OmniAuth provider for OAuth 2.0

Spree Essential Blog is a blog plugin for Spree sites equipped with spree_essentials.

Testbot is a test distribution tool that works with Rails, RSpec, RSpec2, Test::Unit and Cucumber.

a library and command-line tool for quality assessment of de-novo transcriptome assemblies

A simple encoder and decoder for the BitTorrent serialization format.

A Ruby wrapper for the Bronto SOAP API

A simple API caching layer built on top of HTTParty and Redis

A simple API caching layer built on top of HTTParty and Redis

Ruby wrapper for the chargify.com SAAS and billing API using httparty

Checkr - Background check platform for the New World of Work. See https://docs.checkr.com for details.

A Ruby DSL for printing guitar chords diagrams

Extend the Capistrano gem with these useful recipes