Start from here and build whatever you want to.

Wrapper to keep all the common libraries and setups needed by Thecore UI Backend(s).

The best Rails 4.2+ forums engine ever. Its goal is to be as simple and feature rich as possible. Thredded works with SQLite, MySQL (v5.6.4+), and PostgreSQL. See the demo at https://thredded.org/.

A full Rails engine providing e-commerce functionality for any Rails 4 application. Based on Shoppe Rails Gem.

TimeSegment is a substitute of DateHelper distance_of_time_in_words and makes your time more readable.

Description of TinySupport.

File translation and conversion utility

Description of Uibox.

Underworld is a ruby on rails engine which provides a platform to easily build a web application. Features like Dashboard, complex code generation and other awesome features. For more information checkout the docs.

United I18n backend simple with mongoid provider and adds translation functionality to Rails Admin.

With this engine, you can manage multiple Weixin Public Accounts

requires javascript, but implements a slide down forum witb support for a multilingual community. It asks the forum members to provide translations

Extend Zebra Datepicker with translations and localisation based on the excellent rails-i18n and zebra-datepicker-rails gems