You can do irb anywhere by calling 'ir b' (need a whitespace!).

Ivy4r is a Ruby interface for Apache Ivy dependency management library. Offers support for using Ivy with Buildr and Rake.

kaminari-mongo_mapper lets your MongoMapper models be paginatable

Kaminari is a Scope & Engine based, clean, powerful, agnostic, customizable and sophisticated paginator for Rails 3+

A Rspec Helper library for the Kaminari gem

Cloud Foundry automation via manifest documents.

Massimo builds HTML, Javascript, and CSS Files from your source.

A Ruby mailing list library designed to be integrated into other applications.

Mobi is a Rubygem that allows you to easily read MOBI e-book format metadata.

Client library and command-line tool to interact with the Mortar service.

A Ruby wrapper for MPlayer

This gem reads exchange rates from the National Bank of the Republic of Belarus website. It uses it to calculates exchange rates. It is compatible with the money gem

Create Microsoft Word (.docx) files.

A Ruby implementation of OpenXmlPackage from Microsoft's Open XML SDK

Pathological provides a way to manage a project's require paths by using a small config file that indicates all directories to include in the load path.

This gem provides all necessary tools to make a Rails application into a platform with third party applications.

Detects profane words using multiple strategies, including similarities, diacritics(sound alterations), constructions (multi-part), injections and unicode.

Rack middleware for handling large file uploads. Integrates nicely with the Nginx upload module: http://www.grid.net.ru/nginx/upload.en.html

resque-exceptional provides a Resque failure backend that sends exceptions raised by jobs to getexceptional.com.

A basic and perhaps misinformed library for learning about reactive programming