PHPmaker - PHPMaker is a powerful automation tool that can generate a full set of PHP quickly from MySQL, PostgreSQL, Oracle, Microsoft Access, Microsoft SQL Server and SQLite databases.

Bludit - Bludit is a web application to build your own website or blog in seconds, it's completely free and open source. Markdown support.

P4A - Php For Applications - PHP5 RAD Framework based on Zend Framework.

WonderCMS - WonderCMS is the smallest flat file CMS. Completely free, open source, privacy oriented for over 12 years.

MT Backend - MT backend is a PHP control panel solution for websites.

HTMLy - HTMLy is an open source databaseless blogging platform. A Flat-File Blog and Flat-File CMS written in PHP prioritizes simplicity and speed.