Yes, it's a blogging tool - and a pretty brilliant one if you ask us - but PivotX is also a great tool to maintain more complex websites as well. Its powerful core and flexible template system make it easy for developers to adjust and extend.
EZAdmin -- A best-of-breed PHP content management system.
Why another PHP CMS? This one is purely object-oriented, has a rich administration interface, supports themes using a very thorough API, and strives to be compatible with other tools via PEAR
flatCMS is A PHP Website Engine not using any database. Support for different languages. Using the directory-structure for menue creation. Supports Modules. This project is no longer being developed.
Easy Site Builder allows your enterprise users to create and maintain a website with context menus and a standard appearance without knowing a bit of web development. Reads the directory structure and text files... and publishes the site! Written in PHP.
SAPID is a tool for site creation and management. SAPID is distinguished through the comfortable Ajax-based site structure management interface and high flexibility of design, content and functionality integration. SAPID does not need DB (file-flat CMS). SAPID is inline CMS.
Article Manager is a simple content management PHP program to speed up your activity of adding news, articles or press releases into your site. A number of latest article summaries can be included in your main page or press release page with their links to whole article pages.
Content Injector is a powerful and complete Content Management System that will allow you to manage and administrate your site from a web-based interface. The system dynamically 'injects' content from a MySQL into your pages and allows you to easily create menu links to them.
A simple content management system based on PHP and the free and fast MySQL database. Simple to setup and administer. All site settings are easily customized with the administration interface. Runs on an Apache or IIS web server with PHP and MySQL. Full web based administration.