Backdrop CMS is a fork of Drupal. The primary goal of the project is to provide an affordable, robust CMS with a low barrier to entry. This will allow include: a more intuitive user interface, code that is easier to grok, and lower system requirements, which will allow for affordable hosting.
Improvements over Drupal include:
* Revamped layout system
* Comprehensive listing builder
* Configuration stored in JSON for easy import/export & migration
Comes see how to snap together complex websites quickly, and take a peek at the underlying code.