I love Paint.Net on Windows. It's easy, free and gets the job done.
I am looking for something similar for my mac. Preview is able to resize or crop, but sometimes I want to add a shape or combine images. Any ideas?
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See the open-source Paintbrush :
Paintbrush is a simple paint program for Mac OS X, reminiscent of Microsoft Paint and Apple’s own now-defunct MacPaint. It provides users with a means to make simple images quickly, something that has been noticeably absent from the Mac for years.
There is also Gimp, but maybe It's a bit oversized regarding your needs...
seashore comes to mind - its a cocoa native graphics application with fairly basic features that's based off gimp.
You can actually use Paint.NET directly from within a web browser. As of this writing, this only works on Windows PCs, but support is planned for OSX (see edit below).
If you click the "Run" button from within a browser running on OSX, you get the following message:
Spoon.net applications currently only launch on Windows PCs and tablets, but support for Mac is coming soon!