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Moderator note:
The Plugin "Detect Plugin Problems" provided by @Simon Brown in the Plugin Pack, is no longer working correctly. If there are any errors Paint.net will show them in the Settings area
CustomBrushesMini Effects -> Tools
Use custom brushes with Paint.NET.
.............................. ThatOtherApp Effects -> Tools
Edit the current layer in another program without jumping through hoops.
.............................. Printer+ E