Php Stategy Game Engine (phpSGE) is an open tool for creating a php strategy browsergame that you can customize.
PHPsge is very easy to use and it has a simple administration panel (for editing the game), and auto istaller.You can easy canghe the style of your game changing the css (that you can customise or dowload). You can browse the various version here: Features If you want a detalied list see the RoadMap
Download: http://sourceforge.net
Website: http://sourceforge.net/apps/mediawiki/phpstrategygame/