It just makes sense to store mutable, site-wide, admin-level settings in the database. Right? A key-value table may be more flexible, but maybe we don't want to be flexible! If you truly want that flexibility: http://github.com/stephencelis/kvc

A Rails engine that allows any model to act as avatarable, permitting it to have a complete avatar manager

Execute any ActiveRecord Model method in the background

Introspects your database string field maximum lengths and automatically defines length validations.

Execute any ActiveRecord Model method in the background

Programmatic and command-line access to iTunes Connect Reports

Use jQuery's autocomplete plugin with Rails 4.

Crudify is a dynamic resource controller for Rails 3. The idea is skinny controllers with powerful hooks for easy customization.

fake_arel will simulate rails 3 arel syntax for Rails 2.

Keep a DRY history of your ActiveRecord models' changes

Keep a DRY history of your ActiveRecord models' changes

Your summary here

Better integration tests for apps that use Twilio

ActiveConfiguration is an engine that exposes a generic settings store to ActiveRecord models. Made for very configurable applications, it allows you to avoid implementing specific ways to store settings for each model that needs such configuration. If your application isn't very configurable, ActiveConfiguration is probably overkill.

Develop your Rails engines like you develop your Rails applications.

An earth-simulation environment with ActiveRecord models and data

find_by_param is a nice and easy way to handle permalinks and dealing with searching for to_param values

Provides a list of available letters, and a way of fetching the records for each letter.

Adds support in ActiveRecord for foreign_keys, complex indexes and other database-related stuff. Easily create foreign_keys, complex indexes and views.

Social Stream is a Ruby on Rails engine providing your application with social networking features and activity streams. This gem packages the basic functionality, along with basic actors (user, group) and activity objects (post and comments)