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Manage your application's gem dependencies with less pain http://bundler.io

An active model wrapper for the Neo4j Graph Database for Ruby. http://neo4jrb.io

Jekyll is a blog-aware, static site generator in Ruby http://jekyllrb.com

The Cocoa Dependency Manager. http://cocoapods.org

A Ruby web framework where your Ruby runs on both server and client

:+1: Find open source project that are friendly and welcoming https://contribulator.herokuapp.com/

Actor-based concurrent object framework for Ruby https://celluloid.io

A privacy-aware, distributed, open source social network. https://diasporafoundation.org/

Quickly ramp up in new programming languages. http://exercism.io

Chef's community platform https://supermarket.chef.io/

The web, with simplicity. http://hanamirb.org

Classy web-development dressed in a DSL (official / canonical repo) http://www.sinatrarb.com/

Alchemy is a powerful, flexible and user centric Rails CMS. http://alchemy-cms.com

A Rails template with our standard defaults, ready to deploy to Heroku. https://thoughtbot.com/open-source

A lightweight Sass tool set. http://bourbon.io

39 IFTTT/polo Ruby

Polo travels through your database and creates sample snapshots so you can work with real world data in development. http://ifttt.github.io

:chart_with_upwards_trend: The Rack Based AB testing framework http://libraries.io/rubygems/split

The open source error catcher that's Airbrake API compliant http://errbit.github.com/errbit/

A pure ruby implementation of Google's Protocol Buffers https://github.com/ruby-protobuf

GitLab is version control for your server https://gitlab.com/gitlab-org/gitlab-ce/tree/master

A ruby client for the Salesforce REST api.

Shoes 4 : the next version of Shoes

:christmas_tree: Giving back little gifts of code for Christmas http://24pullrequests.com/

Doorkeeper is an OAuth 2 provider for Rails and Grape

Classroom for GitHub automates repository creation and access control, making it easy for teachers to distribute starter code and collect assignments on GitHub. https://classroom.github.com

A simple framework for building APIs with Grape

:beer: The missing package manager for OS X. http://brew.sh

ActiveModel::Serializer implementation and Rails hooks

:package: Bundler for non-Ruby dependencies from Homebrew