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 Curvy 2.0 (Beta currently 2.18)

30 Day Trial. Priced under $100 enquire within

General Modeling
-2D hand drawn curves form 3D objects. Focuses on 3D for art and presentation. Also serves as competent 3D painting software.

UV Mapping
-Maps objects while they are being created. Imported objects should be UV mapped before import.

Mesh Painting
-Directly on mesh but limited tool set, teaming with Project Dogwaffle (even the freeware version) provides much more versatility through real time buffer exchange specially integrated in software.

Rendering
-Real time as you go. No layout features specifically other than boning and posing. Scenes are snapshotted from viewport while Rotate, Pan and Zoom functions adjust shot. Lighting is simply manipulated through two sliders for Base Light and High Light colors.

Support
-Curvy is still a very active project and site linked has its own forum for beta upgrades, questions and galleries.

Development
-Updates are still in the works and many major changes have taken place since the free version 1.6 given away in magazines. Most useful are new boolean and merge operations.

Overall I suggest this to those whom desire to do 3D art for presentation and do not need their models to meet specific formatting requirements.
Also a great tool for encouraging new artists whom don't have the time to try and learn poly modeling. 
A bit more complex to use than Sculptris but also offers a greater tool set.
And I would finally suggest to enthusiasts for the simple fact that it's fun.