I needed an alternative to Adobe Illustrator on my Mac. I just got tired of paying Adobe's price. So, this morning, I picked up an app for my Mac named Artboard. It's available in the Mac App Store and via their website here. If you too need or want a vector based drawing program at a terrific price ($25.99 in the US App store), give it a try.
It does all I need and more!
Tom (... just passing along the info...)