A Ruby static code analyzer, based on the community Ruby style guide.
A library for setting up Ruby objects as test data.
Open Source - thoughtbot
A simple ruby authentication solution.
Documentation for binarylogic/authlogic (master)
A ruby web server built for concurrency
A Modern, Concurrent Web Server for Ruby - Puma puma - a modern concurrent web server for ruby.
The Ruby cloud services library.
fog - The Ruby cloud services library
Minimal authorization through OO design and pure Ruby classes
A Ruby interface to the Twitter API.
— Documentation for twitter (5.14.0)
Ruby ODM framework for MongoDB
Mongoid Tutorial (5.0.0)
General ruby templating with json, bson, xml, plist and msgpack support
Building a Platform API on Rails | CodePath
An extendable Ruby on Rails CMS that supports Rails 4.2+
Ruby on Rails CMS that supports Rails 4.1 - Refinery CMS refinery is the most popular ruby on rails cms and supports rails 3.2 and 4.1. it's easy to extend and sticks to 'the rails way' where possible.