Graphic design: Software recommendations?

I've been using Pixelmator for a long time on the Mac. It's a great alternative to Photoshop. Fairly inexpensive, very slickly done – nice UI, easy to use, really a great piece of software.

But now I'm looking for something similar for vector based drawing. And ideally I'd love something that works great on Android (tablet) or iPad.

I'm going to try out Inkscape on my Mac, as an open-source alternative to Adobe Illustrator.

But does anyone have other recommendations of great vector based drawing tools for Mac, iPad, or Android?

Thanks!
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