So, I just got a mac book pro for college. And well, my old laptop was a PC. What free drawing programs are out there for mac than have pen sensitivity. I really loved paint tool sai. And it seems really difficult to get it to work on the mac with pen sensitivity. Can someone please help? I don't want to have to haul my pc laptop too college with me as well just to work on artwork. I may teach myself how to draw using photoshop, but I want a free version of that as well. I'm a college student, I'm cheap and have no budget for things like this.