Maestrano is the next generation marketplace for SME applications. See https://maestrano.com for details.

Magis Framework Gem

Mailspy allows for quick and easy creation, sending and tracking of email campaigns

Integrate fancy MapReduce Bulding functionality with one gem install

Utilities for translation of Marc21 records to linked open data.

Simple authorization solution for Rails which is decoupled from user roles. All permissions are stored in a single location.

Matic adds attribute accessors and dirty tracking to Mongomatic and optionally shortens field names saved to MongoDB.

MDDB makes analysing molecular dynamics simulations easy

A dashboard for your memcache

Mince interface library to provide a lightweight MongoDB ORM for Ruby.

Mitamirri is a Rails engine designed to be a drop-in substitute for (or companion to) Google Analytics that enables standard analytics tracking in addition to tracking of custom client-side events.

A very simple mongomapper plugin to add friendship functionality to your application

MongoMapper plugin that prevents any fields responding to empty? from being persisted if empty

a simple mongomapper plugin to add a full featured state machine to your models

MongoMapper plugin that removes ID field from EmbeddedDocuments

MongoMapper plugin that uses a UUID instead of the default ObjectID

A very simple mongomapper plugin to add vote up/down superpowers to your models

Mongestry is Ancestry for Mongo, build for ORM Mongoid

Console to administer MongoDB

Simple mongodb based cache for things like Sinatra and Rails which is implemented much like Memcached in hopes that in some cases they're interchangeable. It's based off 'diskcached'.