Unfold3D from PolygonDesign has recently released its Mac OSX versions of Unfold3D 7 with parallel features of its previous platform offerings. The last update to version 7 from version 6 of Unfold3D added a new ISOMAP algorithm that reduces stratching by a factor of 2 or more which means that you double resolution factor on final texture in stretched zones. Unfold3D 7 also sports a density paint map system, new local surface optimization tool, and new point edition workflow. A demo version is available for Unfold3D 7 for OSX here.
