Inkscape
If only there were a free version of Illustrator … or FreeHand … or CorelDraw. Inkscape aspires to be all these things and has lots of support. It still hasn’t reached version 1.0, so it might not be a substitute for the big boys yet. Also, you must have X11 installed on your mac in ordered to run this Unix-based program. X11 can be found on your OS X installation discs, but you may want to steer clear of it unless you know what you’re doing.
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