Modular Gaming Open Source Persistent Browser Based Game Framework
The Flixel Power Tools are a set of plug-ins for Flixel 2.5+
Short, Sweet, and To the Point PHP Framework
Formerly CraveJs, it's for creating JavaScript applications and games.
Create your own online real-time browser-based MMO in your website
MVC2 based HTML 5 enabled Web Application Framework
Open Source Web Template Engine for PHP
A generic framework for the generation of game levels.