As of 1.1.2, its main strength lies in the more than 70 image filters and color adjustments, some of which are unique to Pixelitor. Some of the gradients can also be found only here.
Note that Pixelitor is intended to be powerful rather than simple. You should have some experience with image editors in order to use it, because there isn't much documentation available yet, and many concepts (layers, blending modes, unsharp masking, histograms, etc.) are the same.
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Screenshots (click to enlarge):
Feedback: You can ask for help, discuss Pixelitor, submit bug reports. You can also email me directly (my email address is in the Help/About menu).