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Yes the 'original' format of the animations is Unity, but they are just text files so you could possibly decipher them. And yes the images are png so you can use it in any software. I apologize if this does not meet you needs, but i suppose no matter which software i set it up in, some would be 'left out'.

If i wanted to use them in another software i would download unity for free to see the animation sequences and timings and copy it manually or just recreate them.

And it is not just animation there is also a bit of code to choose a random animation for mobs that have more then one idle or attack animation. And 'code' to flip them when the face in certain directions.