МОНЕТА.РУ (MONETA.MerchantAPI.v2).

Money gem extension for distributed systems

A simple module to assist in formatting unambiguous prices and price ranges in international currencies in a Roman Script context.

Makes it easy to use money with mongoid

A Money-compatible rate store that uses exchange rates from openexchangerates.org.

A gem that calculates the exchange rate using published rates from uphold.com. Compatible with the money gem

Convert MongoDB query to Arel for PostgreSQL + JSON

Simple but powerful tool for managing mongodb databases

ODM for MongoDB

ODM for MongoDB - for Rails 2.3.x

Mongo Followable adds following feature to mongoid/mongo_mapper

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.

MongoDB backend implementation for I18n gem.

Implementation of the acts as list gem for Mongoid

Mongoid::AppSettings allows you to store settings in MongoDB, and access them easily

Simple data preparation from Mongoid to the jQuery DataTables plugin

Facilitates performing queries on collections in embedded Mongoid documents by performing query from the root node

mongoid-encryptor encrypts and decrypts one or more fields in a Mongoid model.

Gem to add basic "follow" features if you're using rails3 with mongoid

Please refer to http://rubygems.org/gems/mongo_followable for latest versions