The Odania Portal is an open source portal system with strong focus on the usage on different domains with different layout/setup.

If your Rails application needs to support more than one locale, then this gem might be of help to you. Because it will set the locale using various defaults.

Base service code

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/.