I’m currently stuck in engine limbo, balancing the pros and cons of each set of tools. I’ll be giving HaxeFlixel a go this time around, though.

Development

FlashDevelop, Haxe, and HaxeFlixel. If nothing seems to be going my way after a few hours, I’ll probably end up rolling my own framework on top of OpenFL.

Graphics

GIMP.

Sounds

Renoise, maybe BFXR in a pinch. WinLAME for transcoding.