A good, simple, solid tagging extension for ActiveRecord

Write Through and Read Through caching library inspired by CacheMoney and cache_fu, support ActiveRecord 4.

It can be useful when you you are developing some app where you will work with meetings, events etc.

Flexible workflow gem.

Manage money in Shopify with a class that wont lose pennies during division!

An easy extension for Paperclip to crop your image uploads using jCrop

Adds typed hstore backed fields to an ActiveRecord model.

OpenConferenceWare is an open source web application for events and conferences. This customizable, general-purpose platform provides proposals, sessions, schedules, tracks and more.

Extends ActiveRecord::Store.store_accessor

ActsAsBookable is a reservation engine for Rails applications that allows resources to be booked. You can define availability rules for bookable models and set costraints to implement different types of booking (hotels, theaters, meeting rooms...)

Extends your user model with friendships management methods

Inkwell provides simple way to add social networking features like comments, reblogs, favorites, following/followers, communities, categories and timelines to your Ruby on Rails application.

ReportsKit lets you easily create beautiful charts with customizable, interactive filters.

Sufia extends the robust Hydra framework to provide a user interface around common repository features and social features. Sufia offers self-deposit, proxy deposit, and configurable mediated deposit workflows. Sufia delivers its rich and growing set of features via a modern, responsive UI

Safe destroy for ActiveRecord.

Creates surrogate keys on ActiveRecord models, sets cache/surrogate headers, and adds a purge method to ActiveRecord objects.

Full-text search for the Mongoid ORM, using n-grams extracted from text.

Dynamically defines roles and grants it permissions

Spree Variant Options is a simple spree extension that replaces the radio-button variant selection with groups of option types and values. Please see the documentation for more details.

Translation Center is a multi lingual web engine for Rails 3 apps. It builds a translation center community with translators and admins from your system users.