Blender 2.60a
http://www.maxwellrender.com/index.php/home/maxwell_for_sketchup
Integrated, No Watermark, 800 max, works also inside the Free versions of Googkle Sketchup 6,7,8 
Plugin for Rhinoceros or as Stand alone! 
Triangle Mesh Completer by Aiem
Use MeshLabfor convert file format 
IGeo
Accept in Import Export 3dm , OBJ file formats
Open Source: Documentation and tutorials very well presented!
Only for for happy fews who love to go inside Processing Language
Wings3D 1.4.1 - Polyhedra as Cutter Plugin( http://nendowingsmirai.yuku.com/topic/7692/Polyhedra-as-Cutter-Plugin-Reworked )
http://www.wings3d.net
Art Of Illusion to Sculptris… Test
Don’t know if it was posted before … but have you seen www.3dtin.com. Nothing to install, it’s in Flash in the Browser! There’s a bunch more Flash apps at www.alternativeapps.tk …
http://usa.autodesk.com/adsk/servlet/pc/item?siteID=123112&id=13571320
Softimage Mod Tools. It’s a bit like its bigger brother Softimage, yet has enough features to make free or smaller games with.
b.t.w. I made a search in this topic, and hopefully the link it’s not a repeat.
