A Ruby DSL for exporting MongoDB to MySQL or PostgreSQL. You don't need to install both, just one. Use EXPORT_DBMS=[mysql|postgres] environment variable to specify the appropriate adapter.

Simple job queue system based on mongodb

Ruby A/B testing on MongoDB

Gem for crawling data from external sources

Strategies for cleaning databases using Mongo. Can be used to ensure a clean state for testing.

Mongo data store for Dragonfly

An Event Store

Plugin for read-only content websites with MongoDB storage. Works perfect with Rambler&Co CQRS projects

gridfs-rackdav enables you to use GridFS as backend for WebDAV collections with RackDAV application

Rack middleware for Mongo GridFileSystem

it said optional

Quick and easy mapping with MapPLZ

Lightweight wrapper for MongoDB documents

Basics Object Mapper for Mongo

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ODM for MongoDB

ODM for MongoDB

ODM for MongoDB - for Rails 2.3.x

Snapshot your mongodb in the EC2 cloud via XFS Freeze

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.