Wikipedia
BansheePHP
Banshee is a Content Management Framework written in PHP, which aims at being secure, fast and easy to use. It has a Model-View-Controller architecture ( XSLT for the views). Although it was designed to use MySQL as the database, other database applications can be used as well with some effort.
Ready to use modules like a forum, photo album, weblog, poll and a guestbook will save web developers work when creating a new website. Libraries for e-mail, pagination, HTTP requests, database management, images, cryptography and many more are also included.