I think Mac/Linux compatibility will be possible, but I haven't started in on it yet. One thing I believe I'll need to do is make it a lot clearer what endianness I expect when working with the .j2l and .j2t files.
Animations: Yeah, I don't really know how that's going to work, so I'll probably look through the giant idea thread for interface suggestions. People apparently don't like sliders, and you should be able to delete animated tiles without messing up all the lower ones, but I don't presently know what else should happen on that front.
Masks: That's an interesting idea and I'll see how it would look.
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