Geo calculations in ruby and javascript

Get IP and location data using freegeoip.net - can also calculate of distance between map points using haversine supporting multiple distance units

For those that use Kanban or Scrum and want to print their cards so they can stick em on the wall

Caches retrieved information to your user profile and reuses it when you query again.

Code presentation tool using git

A Ruby library for limiting the number of times a method can be invoked within a specified time period.

Because Blogojevich would be too tough to remember. It's a pluggable blogging system for Rails 3.

Provide `notice` method to user model to save notices and to shows them later in views with Gritter (growl-like jQuery plugin). Fully support of Rails flash messages also. Helpful to send flash messages from background jobs.

A simple way to grab recent activity on a given model grouped by hour, day, week or month (time series). Supports "padding" for intervals without activity.

This gem adds a helper and generator to facilitate the use of Head JS in your Rails 3 projects the same way you would normally add javascript tags using Rails default helpers.

Simple Heatmap generator in Ruby. (Requires ImageMagick)

An edit-in-place gem that uses the JEditable jQuery plugin to post updates to the server via AJAX.

Mastercoin wallet using QT bindings to create a useful gui wallet

An elasticsearch wrapper for mongoid odm based on slingshot. Makes integration between ElasticSearch full-text search engine and Mongoid documents seemless and simple.

A sinatra memcached-manager that allows you to view status, flush/view keys and so on. Also easily pluggable to a Rails app.

Mirage aids testing of your applications by hosting mock responses so that your applications do not have to talk to real endpoints. Its accessible via HTTP and has a RESTful interface.

Beautiful logging for Mongoid

Mongoid_commentable provides methods to create commentable documents

Add multiple tag fields on Mongoid documents with aggregation capability.

OperaWatir is a part of the Watir (pronounced water) family of free software Ruby libraries for automating web browsers. OperaWatir provides a querying engine and Ruby bindings for a backend Java library, OperaDriver, for driving the Opera web browser. It aims for full compliancy with the Watir 2 and Watir 3 specifications.