Dust3D is a new application unlike any other 3D modeller I’ve used. It’s free, open source, runs on Mac and Windows, with Linux support possible if you compile it yourself. What makes it unique however is it’s approach to modelling. Essentially you model by create a series of circles along two axis, which act as loft points for the generated mesh. Really it’s one of those things you need to see in action to understand… thankfully I’ve made this video showing exactly that.
Dust is certainly not for creating highly detailed 3D models, instead it’s more useful for rapidly creating base meshes, which can then be exported in OBJ format and sculpting/refined in other 3D modelling applications.