Loudmouth adds commenting to one or many of your models.

Machete is a simple tool for matching Rubinius AST nodes against patterns. You can use it if you are writing any kind of tool that processes Ruby code and needs to do some work on specific types of nodes, needs to find patterns in the code, etc.

Magento API libraries and other helpful Ruby code. For ruby 1.8.7

[JRuby portion] of the original MailCatcher. MailCatcher runs a super simple SMTP server which catches any message sent to it to display in a web interface. Run mailcatcher, set your favourite app to deliver to smtp://127.0.0.1:9000 instead of your default SMTP server, then check out http://127.0.0.1:9090 to see the mail.

Convert mail to a one line log message.

MarketoAPI (marketo-api-ruby) provides a native Ruby interface to the {Marketo SOAP API}[http://developers.marketo.com/documentation/soap/], using {savon}[https://github.com/savonrb/savon]. While understanding the Marketo SOAP API is necessary for using marketo-api-ruby, it is an explicit goal that working with MarketoAPI not feel like working with a hinky Java port. This is release 0.9.1, targeting Marketo API version {2.3}[http://app.marketo.com/soap/mktows/2_3?WSDL], fixing a +syncLead+ problem where +Id+, +Email+, and +ForeignSysPersonId+ are inconsistent with other +syncLead+ parameters. This fixes an issue with Marketo campaign methods. Please note that Ruby 1.9.2 is not officially supported, but MarketoAPI will install on any version of Ruby 1.9.2 or later.

{Marlowe}[https://github.com/KineticCafe/marlowe] is a Rack middleware that extracts or creates a request ID using a pre-defined header, permitting request correlation across multiple services. When using Rails, Marlowe automatically adds itself to the middleware before <tt>Rails::Rack::Logger</tt>. As of Marlowe 3.0, a Faraday middleware is provided (<tt>require 'marlowe/faraday'</tt>).

Tools to inspect and analyze Ruby's Marshal serialization format. Supports the Marshal 4.8 format which is emitted by ruby 1.8 through 2.x.

Ruby Marvel Comics API library

Explore the Marvel Universe like never before.

Send Mandrill template emails

Basic implementation of the Mastercoin protocol.

A CLI that provides a formatted and highlighted view of Markdown files in a terminal

A Ruby gem with a lot of distance measures for your projects.

Mechanize-Progressbar shows ProgressBar when HTTP GET access of Mechanize(Mechanize#get, Page::Link#click, response of Form#submit). It requires 'progressbar' gem. HTTP POST is not supported.

Collect and analyze memory usage data for each individual Rails action controller.

Messenger: easy message sending for various protocols.

Ruby API layer that transparently queries, scrapes and caches Metal Archives' website

Automated deployment of your Middleman blog to Github Pages

michelson - test simulator / runtime for type-safe 'n' functional (crypto) contracts