2D GPU-accelerated framework for ActionScript developers
MMORPG
Modern AS3 Game Engine
A Flash Molehill (Stage3D) GPU accelerated 2D game engine
A free ActionScript 3 library designed for developing 2D Flash games
The Flixel Power Tools are a set of plug-ins for Flixel 2.5+
Actionscript 3 Particle Engine for Flash and Flex