Hey all!
I was recommended by a friend to post a link to my project here, and it could be of some interest to you guys!
Not directly relating to Haxe, since it's a tool written with AIR, and currently only supports PNG Sequence or Starling spritesheet export options, but with time I myself plan to use it with NME, and add more spritesheet export options for Corona (since the Spritesheet haxelib works with that)
ANYWHO:
https://github.com/PDeveloper/SpritesheetGenNo downloads yet, but will get an AIR package up on there asap. Meanwhile, you should be able to download the source and compile with no problems from scratch!
Let me know of any bugs, feature requests, or just comments on how it flows! :)
P.