A gem that allows you register media types and unmarshal/marshal data accordingly

It is a very simple Rails plugin to help you customize your pages' meta tags a little bit easier.

A low-drama portfolio generator for your middleman site.

Milkmaid is a command-line client for Remember the Milk

A collection of assertions for use with minitest and activerecord. Simplifies testing associations and validations by introspecting associations and validations for you models.

Patches MiniTest to allow for an easily configurable output. For Ruby 1.9 :Datches MiniTest to allow for an easily configurable output. For Ruby 1.9 :D. Inspired by leftright, redgreen and other test output gems, with an emphasis on configuration and style

Machine learning library in Ruby

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.

Modesty is simple and scalable split testing and event tracking framework. It was inspired by assaf's Vanity (github.com/assaf/vanity).

Makes it easy to use money with mongoid

MongoHydrator takes a document, represented as a Ruby Hash, and efficiently updates it so that embedded references to MongoDB documents are replaced with their corresponding subdocuments.

mongoid plugins

Library for translating Mongoid documents, based on Globalize3 principles

Fully featured tree implementation for Mongoid using materialized paths and relative associations. Featuring Depth and Breadth first search.

Mongomatic is a modular Ruby object mapper for Mongo

Autodiscovers feeds from urls

This gem will install as a daemon and can be used to connect to a graphite and a carbon backend. It will not only post the data for the metrics but also create graphs into graphite, by means of a translation from munin-node.

A gem to shorten URLs using different services, it has one command-line utility for each supported service and one for custom shorteners called 'shorten'.

must_be provides runtime assertions which can easily be disabled in production environments. Likewise, the notifier can be customized to raise errors, log failure, enter the debugger, or anything else.