Mold is a view template handler for Rails 3+ that renders Ruby objects to JSON.

Monad is a simple, blog aware, static site generator based on jekyll.

keep track of money in a group

A de-duplicating priority queue that uses mongodb as the storage engine.

Simple appointment scheduling for rails

Prevent fields from being updated by including a mongoid module and marking the fields as immutable.

Adds synchronized lock-like behavior to a mongoid model instance

MongoidNestedFields allows you to handle complex data structures inside one field in MongoDB. It also validates whole object graph on field validation

OpendID Store using Mongoid

Adds Semaphore-like behaviors to a Mongoid::Document instance

simple fields trimmer for mongoid

You are probably looking for voteable_mongo, this is just the correct spelling, not for download...

Generators for use with the MongoMapper rubygem. Use to generate Documents, EmbeddedDocuments, and Rails initializer.

I18n for MongoMapper, just as in ActiveRecord

It is a MongoMapper's plugin to add auto incremented id in MongoMapper's documents.

Simple object mapper for MongoDB

A simple way to load your sessions from a MongoDB store

MongoTagger, a tagging plugin for MongoMapper

Rails specific I18n model localization meant to tie-in to existing ActiveRecord models, ala Globalize2, backed by MongoDB rather than an RDBMS. May include UI elements, too.

A ruby gem for adding watching to mongo documents.