A powerful PHP framework for web applications
Modular Gaming Open Source Persistent Browser Based Game Framework
The Flixel Power Tools are a set of plug-ins for Flixel 2.5+
BxEngine For Marmalade And QT
Short, Sweet, and To the Point PHP Framework
Cross platform 2D game creation framework with Python bindings
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
This is a base PHP framework for making simple websites with clean URL
Open Source Web Template Engine for PHP
C++ SDL/Box2d Programming
A generic framework for the generation of game levels.