Tetragon

FlashPunk

A free ActionScript 3 library designed for developing 2D Flash games. It provides you with a fast, clean framework to prototype and develop your games in. This means that most of the dirty work (timestep, animation, input, and collision to name a few) is already coded for you and ready to go, giving you more time and energy to concentrate on the design and testing of your game.

StarlingPunk

StarlingPunk is a framework built on top the Starling library designed to add structure and organization to your 2D game projects. It’s perfect for rapidly prototyping ideas and promotes code reuse between projects. As you may have been able to tell from the name, StarlingPunk is heavily inspired by the popular FlashPunk framework, although its not a direct port.

Pixelizer

A component based game engine for AS3. Master version is currently 0.4.3. Please note, the dev branch is currently under heavy development for 0.5 and should be considered unstable. There will be a few breaking changes.

AS3isolib

as3isolib,v1 - The new home for the as3isolib.v1 project previously hosted on Google Code.