I'm surprised noone has mentioned HaXe[1] : Which is an open source Actionscript-like language, with types (if you want them), which can compile down to .SWF, .

I'm surprised noone has mentioned HaXe[1] : Which is an open source Actionscript-like language, with types (if you want them), which can compile down to .SWF, .JS, .CPP or even .PHP. All with an open source tool-chain. [1] : http://haxe.org/doc/intro http://haxe.org/doc/intro