The FFilmation Engine is an AS3 isometric programing engine, focused mainly on game development. The aim of the project is providing a robust development platform, where game designers can work on the game’s details and forget about the render engine. It is intended to be really usable from a “real production scenario” point of view.
The PushButton Engine is an Open Source, Flash game engine and framework that’s designed for a new generation of games. PushButton Engine makes it easy to bring together great existing libraries and components for building Flash games. Spend less time on code, more time on building fun games.
The Citrus Engine is a Flash sidescrolling platform game engine built on the power of ActionScript 3.0 and Box2D. The Citrus Engine was built to allow designers and developers to quickly and easily create platform games (also called side-scrollers) like Super Mario Brothers. Teams can use the Citrus Engine for advergaming, marketing and casual games for game portals.
Yogurt3D Game Engine is a brand new 3D Flash engine that doesn’t require users to download plug-ins because it works inside your browser via Adobe Flash Player. Yogurt3D’s core part, SwiftGL, is open-source and compatible with OpenGL. This means developers who already program in OpenGL can easily develop 3D Flash games and applications. They can easily transform their old OpenGL codes into SwiftGL and run their existing games in Adobe Flash.
flixel is a completely free collection of Actionscript 3 files that helps organize, automate, and optimize Flash games; an object-oriented framework that lets anyone create original and complex games with thousands of objects on screen in just a few hours.