Underlay is built PHP version 5 and requires NO database, it's designed to work on shared hosting and has very low base needs. It bridges the gap between a basic HTML website and those requiring a full content management system like WordPress, Joomla or Drupal.
Underlay is as simple as possible in every way - from installation and usage through to upgrading and maintenance.
Underlay separates out your content from your design and pulls it all together through it's engine.
My current prototype version allows you to take any HTML design, add a few special Underlay tags and your content and have a website up and running in no time at all.
The beauty of Underlay's simplicity is you can take a design you have, or a purchased theme, or an existing HTML website and convert it with very little knowledge to something you can easily maintain with clear separation between the content and the design.