MongoJob is a MongoDB-backed Ruby library for creating background jobs, placing those jobs on multiple queues, and processing them later.

Port of classic Rails ActsAsTree for MongoMapper

Add simple archive / soft delete functionality to your MongoMapper models.

Auto increment for MongoMapper

Diagram generator for MongoMapper

Extensions for MongoMapper

MongoMapper replicaset fallback mechanism

I18n for MongoMapper, just as in ActiveRecord

Mongo Mapper Parallel can perform MapReduce-like operations on an entire collection in parallel. This is a non-blocking operation, so the scripts can invoke database methods (db.collection.update, db.collection.insert, etc...) at blazing speed.

Mongo Mapper ActsAsParanoid Plugin, modeled after Ryan Bigg's plugin

Simple full text search for MongoMapper ODM

Mongo Mapper Strict Keys Plugin.

MongoMapper plugin for generating fixtures

Add simple autogenerated tokens to your MongoMapper models.

An Acts As Tree like implementation for MongoMapper based on mongo_mapper_acts_as_tree

Versioned plugin for MongoMapper

Port of awesome_nested_set for MongoMapper

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.