Ruby

Redmine

Redmine is a flexible project management web application written using Ruby on Rails framework. It is open source and cross-platform.

HatchBox

HatchBox offers high-quality 3D printing filaments for a wide range of applications.

Sidekiq

Sidekiq is a simple, efficient background processing for Ruby. It uses threads to handle many jobs at the same time in the same process. It does not require Rails but will integrate tightly with Rails 3/4 to make background processing dead simple.

HoundCI

HoundCI is a hosted service that comments on Ruby style guide violations in your GitHub pull requests.

Ruby Toolbox

RVM