The VirtualBox ruby gem is a library which allows anyone to control VirtualBox from ruby code! Create, destroy, start, stop, suspend, and resume virtual machines. Also list virtual machines, list hard drives, network devices, etc.

RProgram is a library for creating wrappers around command-line programs. RProgram provides a Rubyful interface to programs and all their options or non-options. RProgram can also search for programs installed on a system.

Anemone is a Ruby library that makes it quick and painless to write programs that spider a website. It provides a simple DSL for performing actions on every page of a site, skipping certain URLs, and calculating the shortest path to a given page on a site....

A Rake-based text templating system, allowing easy rendering and update of page-based templates with layout and ERB, with optional plain-text markup for HTML.

A parametrical 3D-CAD application for the Gnome desktop,

A full port of Perl's Win32::Console and Win32::Console::ANSI.
It allows working with Windows' Consoles much more easily (changing colors, positioning cursor, querying info, and emulates ANSI control characters).

A simple Ruby Wakoopa API wrapper, built to give you an ActiveRecord-like way to fetch your software usage data.

A Ruby script to automatically generate a static HTML gallery (series of different albums) for your local photo collection - so you can publish it on e.g. S3.

bn4r is a bayesian networks library on ruby that provides the user with classes for create bayesian networks and diverse algorithms for solve them.

Project devoted to providing a community interface for building, implementing, and support extensions to the nuXleus XML Messaging Virtualized Appliance.