Tagtical allows you do create subclasses for Tag and add additional functionality in an STI fashion. For example. You could do Tag::Color.find_by_name('blue').to_rgb. It also supports storing weights or relevance on the taggings.

Delayed_job (or DJ) encapsulates the common pattern of asynchronously executing longer tasks in the background. It is a direct extraction from Shopify where the job table is responsible for a multitude of core tasks. This gem isa topprospect fork (http://github.com/topprospect/delayed_job) of the collectiveidea's fork (http://github.com/collectiveidea/delayed_job).

Switches between standard SQL and extended SQL syntax depending on the adapter.

Import tweets into Pligg.

gem install universe-db

Browser front-end for navigating and modifying mySQL databases

Warouz Server is the server side part of an extensible system for collecting data from multiple remote warouz clients.

Perform weighted averages, even across associations. Rails 3 only because it uses ARel.

Whurl is a mountable engine for Rails 3.1+ apps allowing you to show the functionality of your API. You can save API calls and share them with your team or the public.

WontoMedia is a Ruby-on-Rails web app for community creation of an information classification scheme. WontoMedia is free software (licensed under the AGPL v3), and is being developed by a dispersed volunteer team using agile methods.

WPB (WordPress Bash) provides a Terminal interface to WordPress. It uses ActiveRecord, which means the sytax is mostly the same

A script for backing up mysql databases using ZFS