You don't have to wait until Ruby 2.0 to get (named|keyword) arguments support. Arguments has been tested with Ruby 1.8.6 and ruby 1.9.1 and eventually will work with JRuby (if someone is interested in contributing, I guess is possible since merb-action-args works with JRuby)

A ruby interface for dvd-slideshow utility (http://dvd-slideshow.sourceforge.net)

Reactive is a desktop application framework that gives everything needed to create database-backed applications according to the Model-View-Control pattern of separation. Reactive is highly inspired and also uses code of Rails, the famous Web-Framework for ruby. In Reactive, the model is handled by what's called an object-relational mapping layer. Reactive doesn't impose any ORM, you may choose the one you like but Reactive defaults to Active Record. This means it has baked in support for it, without forcing you to use it. The view part is independant of Reactive, this means that the application has to choose a view provider and feed it into Reactive. This leads to complete freedom for the GUI part. View providers are packaged as gems, so that it is easy for the developer to choose and install them. Look for reactive_view_* to discover some view providers (at this early alpha stage, only reactive_view_wx is available) The controller is part of Reactive and is loosely coupled to the view. Simple convention set up the link.

This is a view provider for Reactive, the desktop application framework, it provides views based on the wxWidgets library. For this the ruby port wxRuby is used.

Reconsidered adds a vital and sorely missed language feature to Ruby: the well known and widely loved GO TO operation.

record - named tuples / records with typed structs / schemas

Search on a text file using binary search

An interface library to use the Amazon E-Commerce Service 4.0 (ECS4.0) API on Ruby.

Recurring allows you to define Schedules, which can tell you whether or not a given Time falls in the Schedule, as well as being able to return a list of times which match the Schedule within a given range.

Recursive Rake Tasks meant for generating rake tasks for all directories which contains *_spec files Under given directory.

Red writes like Ruby and runs like JavaScript.

Client library for the Redmine Ticket Server

This library is intended to provide a reducer library on collections for ruby like the clojure reducers

A multi-line search and replace utility that uses Ruby regular expressions for searching and allows back references to captured groups from the pattern to appear in the replacement text.

Celerity is a JRuby wrapper around HtmlUnit – a headless Java browser with JavaScript support. It provides a simple API for programmatic navigation through web applications. Celerity aims at being API compatible with Watir.

Reittiopas is a Ruby library for accessing the [Reittiopas Developer API](http://developer.reittiopas.fi/pages/fi/reittiopas-api.php). Requires an account to the service that can be requested through [the account request page](http://developer.reittiopas.fi/pages/fi/accountrequest.php).

Rejuicer.

The relative library enhances Ruby's core and standard libraries to support naming, opening, and reading files relative to the Ruby file currently being interpreted (the contents of the __ FILE __ identifier). This functionality is especially useful in embedded Ruby (eruby, erb, erubis, etc.) where absolute paths or paths relative to the interpreter's current working directory are problematic (due to file system structures and working directories varying across platforms and web servers).

It's metastable

Provides single sign on for web applications using the CAS protocol.