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

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.

Create Microsoft Word (.docx) files.

A basic and perhaps misinformed library for learning about reactive programming