A tween based animation system for JavaScript game engines. Ported over from my L7 engine and was used in my game Dragon Plunder.
Plunder is a powerful, expressive animation system that really helps out simple game engines like ImpactJS. Even in more full fledged engines such as Lime, you may still prefer to use Plunder over the built in system, it's goal is to be that good.
Plunder is about 2 days old at this point. I started porting it over from existing code and organizing it. The built directory will eventually contain a consumable version, but for now it's just the coffee files compiled and concatted together. If you are adventurous and curious, your best bet right now is to see how Plunder's website did the main example. But probably better to just wait :)
It will change and grow a lot. Just an initial prototype thrown up for now.