Small sprite editor for the game maker.
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Considering what you get and in comparison with some competitors, you have to say that this is a pretty inexpensive piece of software. If you use it, you are free to make a donation. Otherwise Pixla is "free".
Pro Easy to use
Clean, uncluttered interface which is a must for a tool like this.
The style of the GUI might seem a little outdated, but that is a matter of personal taste more than anything.