PHPForest is planned to be a powerful wiki engine based upon CVS and MySQL. At the moment it's under development (actually, it's just begun) and isn't currently usable, but the intent is to create a highly flexible and powerful website engine.
The basic concept is a virtual file system (implemented as a CVS repository with file metadata stored in an SQL table) upon which handlers for various file types performs relevant actions on whatever file is requested. This would include translators for using XML/XSLT, HTML and parsing Wiki pages with the capability of writing additional modules. (Similar to Apache's Handler directive)
Planned Feature List:
Update 14/02/2005: Development has moved forward... ever so slightly. - I have a PHP class which allows rudimentary CVS operations (add, get, delete, edit commands). Next step, the virtual filesystem manager class. :-)
-- Stuart Longland (stuartl -at- longlandclan.hopto.org)