I've been using the free SketchUp (now SketchupMake) for many years, and it seems that no longer exists. I think it's been replaced with a new web-only free version. I found it to be pretty nice for simple woodworking and home projects, with a rather intuitive interface. My use was so casual and infrequent that I never really considered the paid version.
Is there a good alternative (free or reasonably priced paid) for very simple and casual 3D modeling?