Active Merchant is a simple payment abstraction library used in and sponsored by Shopify. It is written by Tobias Luetke, Cody Fauser, and contributors. The aim of the project is to feel natural to Ruby users and to abstract as many parts as possible away from the user to offer a consistent interface across all supported gateways.
JSXGraph is a cross-browser library for interactive geometry, function plotting, charting, and data visualization in a web browser.
Make your shoulda contexts faster
A shell script which turns your OS X laptop into an awesome development machine.
Facebook SDK for Android
Keep a DRY history of your ActiveRecord models' changes
open source implementation of Twitter/iPad stacked ui - done right.
Easily accept payments on iOS
A flexible, advanced split-view controller for iPad developers.
Stripe Android bindings
Stripe bindings for iOS and OS X
Surface tablet application
SendGrid Python Library
Ruby on Rails
A distributed Test Suite runner for Rails, using Eventmachine and Redis
A Rails plugin to allow versioning of restful routes
asynchronous python driver for mongo
Solr-powered search for Ruby objects
SOAP4R is an implementation of SOAP 1.1 (W3C Note) for Ruby
PLEASE CHECK http://github.com/lifo/docrails/wikis
Forms made easy for Rails! It's tied to a simple DSL, with no opinion on markup.
simple form builder
Makes tests easy on the fingers and the eyes