A lightweight web content management framework released under open source FreeBSD license.
It does not use any database, simply the file system.
It uses themes, which are straightforward to create or modify existing ones.
Using it is nearly as easy as creating a single html page.
It is portable and easy to deploy in PHP, and can be extended to incorporate other frameworks as well (such as ecommerce, etc).
Download: Latest Version
StayCMS is Free Software
The latest release is Alpha 0.6 dated May 06, 2012.
All versions of StayCMS packages, modules, themes are available.