Trinity is a minimalistic Ruby web framework for publishing Linked Data.,

Net::Flickr is an elegant, Ruby-fied implementation of Flickr's REST API.,

travis-lint is a tool that check your .travis.yml for possible issues, deprecations and so on. Recommended for all travis-ci.org users.

Net::DNS is a pure-Ruby DNS library, implementing a resolver and, in the future, a name server. It supports many RR types, and more will be added. It has a nice OO interface, a clean extendible code and a lot of interesting features.

Net::SSH is to SSH as Net::Telnet is to Telnet and Net::HTTP is to HTTP. Perform non-interactive SSH processing, purely from Ruby!

See Project Euler website,

TextMate support for Flex.,

Amazing is a ruby programm, what allows you to feed 'awesome's (a tiling window manager) statusbar with various data.

A Ruby library that presents an intuitive and natural interface to an LDAP directory, modeled after Sequel, a library that does the same thing for RDBMSes.

A series of packages that provide interfaces to Google's webmail service.
Please do not use this library for the real world application.
It is unstable and may be not worked in a certain environment.