Use migrations and simple syntax to manage constraints in PostgreSQL DB.

A WebSocket client implementation for EventMachine

Enchant is tool aimed to discover web application directory and pages by fuzzing the requests using a dictionary approach

View helpers 'header' and 'footer', along with an assets generator to make any site look like http://engineyard.com

Ephemeral lets you define one-to-many relationships between in-memory objects, with ORM-like support for where clauses and chainable scopes.

fake_arel will simulate rails 3 arel syntax for Rails 2.

A tool designed to speedup library loading (startup time) in Ruby by caching library locations

(Fork of official typhoeus that enables cookie support) Like a modern code version of the mythical beast with 100 serpent heads, Typhoeus runs HTTP requests in parallel while cleanly encapsulating handling logic.

typecast output plugin for fluentd

FlyData Agent

foursquare-api is a Ruby wrapper for the new Foursqauare V2 API

Large collection of useful Rails 3.1 helpers for SEO, Metatags, Facebook OG tags, integration for analytics services like google, woopra, olark, mixpanel and much much more...

Geo calculations in ruby and javascript

Get IP and location data using freegeoip.net - can also calculate of distance between map points using haversine supporting multiple distance units

Allows for easy parsing of Strings, Hashes and Arrays into a GeoPoint with lat/long

Easily convert between different distance units such as kms, miles etc.

For those that use Kanban or Scrum and want to print their cards so they can stick em on the wall

Code presentation tool using git

A Ruby library for limiting the number of times a method can be invoked within a specified time period.

A tiny gem that makes using Google Translate v2 API trivial