Does anyone know any great ones?
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It depends on what you're looking for. If you're looking for something free, Paint.net is a great bitmap graphics editor for Windows. GIMP is a similar, but more powerful and slightly more difficult editor for Windows, Linux and Mac OS X. (It's mainly a bitmap editor, but I believe it has vector support.)
You can also try looking at more professional editors, like Adobe Fireworks, which is a vector/bitmap editor. I believe several people on Scratch use Fireworks, in fact.
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I used Xara for some time. It's a very easy to use vector editor, but it's not free. ^^
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Thanks everybody!
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