The short answer is yes, there are lots of alternatives. The long answer is no, not really. I’ll try to keep the long answer short: It all depends on what you need, what you do, what your budget is etc. Rhino can do a LOT of different things for different people: Industrial design, mechanical design,algorithmic design (Grasshopper), architecture, boats, jewelry, art and installations, 2D/vector graphics and the list goes on and on - all for a very small price; at least compared to other programs in the field of 3D CAD - and with a tool set that is actually both simple for the beginner (and those who don’t need a lot of bells and whistles) and sufficient for the advanced user. But again, it all comes down to what you need to do. So tell us a bit about your needs, and I’m sure someone will chime in with possible alternatives.