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

Currency converter

fixer.io support for money

The gem provides integration for Money gem with webservice provided by Hungarian National Bank

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'.

A simple little gem that makes it easy to handle case-insensitive alphabetizing for Mongoid document models

Able to do something like 'bookmark', 'like' or 'follow' with mongoid

Makes it easy to use geo calculations with Mongoid

Simple appointment scheduling for rails

Mongoid index creation and removal the nice and easy way :)

Easily use markdown with mongoid texts

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

Full text search for mongoid using xapian

Automatic Mongoid eager loading

mongo_persist

Moniker Ruby and RoR bindings implemented with ActiveResource - See also http://www.unicloud.it

monkes21 gem - generate your own monkes twenty one 28×28 pixel avatar images from the 100+ official text attributes (via built-in spritesheet); incl. 2x/4x/8x zoom for bigger sizes and more

Fancy console output tools

Changing your dev environment, one keystroke at a time

This gem allows you to connect to the moreapp API to send instructions and retrieve the registrations