Metasploit Framework

Server automation framework and application

Roll your own crowdfunding

Cloud Foundry BOSH is an open source tool chain for release engineering, deployment and lifecycle management of large scale distributed services.

A tiny 32 bit kernel written in Rust

Docker and Ruby based PaaS

a ruby workflow engine (dead)

Docker-based PaaS in Ruby

restful workflow engine based on Rack and ruote (Warning : ruote-rest will be replaced by ruote-kit soon)

A wrapper around dscl that behaves like useradd.

Official Mailin provided API Ruby wrapper