Rubysh: Ruby subprocesses made easy
RSH is a UNIX and SH compliant shell built in Ruby. It features all the traditional Shell commands (basically anything in the $PATH)
Provides various overloads, classes and methods to allow for more complex mathematics
Tools for the unix shell
A rubist way to run shell commands
RComposite (formally Rubyshop) is an RMagick abstraction library to easily manipulate and composite images through the use of a canvas, layers, layer masks, adjustment layers, fill layers, and layer sets (much like in Photoshop)
Ruby client for OpenShift REST API