Autodesk has released Mudbox 2009 for the Mac
(http://usa.autodesk.com/adsk/servlet/index?id=10707763&siteID=123112).
Designed by professional artists in the film, game, and design
industries, it sports a toolset of stencils and brushes for creating
3D characters, environments and props.

Autodesk Mudbox 2009 is an application for painting, texturing and
re-touching 3D models. Mudbox software gives 3D modelers, artists and
designers the freedom to create without worrying about the technical
details, according to Stig Gruman, Digital Entertainment Group vice
president, Autodesk Media & Entertainment. Breaking the mold of
traditional 3D modeling applications, Mudbox 2009 provides an organic
brush-based 3D modeling and texture painting experience that ignites
the creative process, he says.

Autodesk Mudbox 2009 costs US$745. A demo is available for download.