https://github.com/Detea/PekaSE2
A modern Pekka Kana 2 sprite editor, with the goal to make creating sprites as convenient as possible.
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Play your sprites animations in the editor
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See changes instantly, if you change the color of your sprite
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Listen to your sprites sounds within the editor
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and more!
A little warning, though... the code is mostly auto generated GUI code and the rest is pretty hacky/ugly. Mostly because of the PK2 sprite format, but that's ok. Just know that the code isn't nice to look at.