Spree Active Sale makes it easy to handle flash sale/ daily deals behavior with in a spree application. By this, you can have a variant, product, or group number of products in a taxon, attach that variant, product, or taxon to a sale event with a start and end date for scheduling. So that, your sale event will only be available between the dates given and when the sale is gone(i.e. not live), it will not be accessible at any point till you create a new one or re-schedule the same.

TalkingStick is a Rails Engine that provides easy group-based video conversations, all thanks to the power of WebRTC.

Allows to define special attributes for ActiveAdmin panel to make it AJAX loadable and auto-updatable

Almanac is the most elegant mountable blog engine that can be easily hooked up in the existing Rails application.

Carnival is an easy-to-use and extensible Rails Engine to speed the development of data management interfaces. When you use Carnival you can benefit from made features that are already done. If you need to change anything, you can write your own version of the method, using real Ruby code without worrying about the syntax of the engine.

Pagar.me engine for catarse

PaypalExpress integration with Catarse crowdfunding platform

Edit live website copy.

A data curation Ruby on Rails engine built on Hydra and Sufia

Based on heroku dataclips feature, SQL -> Dataset

Simple Dismissible help text for your Rails projects

Gamification is a collection of models for Ruby on Rails that allows you to make anything a game

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

Provides a set of valuable features for Registration, Authentication, Management and Internationalization.

Maestrano is the next generation marketplace for SME applications. See https://sme.maestrano.com for details.

Web UI for MailyHerald - Email processing solution for Ruby on Rails applications

OkuribitoRails is an engine for Rails that aims to manage method call status. And you can identify uncalled methods.

ScheduleFu allows scheduling events with dates and times. It includes both the model and view portions of a calendar. It borrow heavily from acts_as_calendar (http://github.com/dball/acts_as_calendar) and calendar_helper (http://github.com/topfunky/calendar_helper).

An implementation of role-based policies and operations to help controllers lose weight.

Rails engine supporting multiple auth providers per user.