ModelPress Desktop 

Use ModelPress Desktop to view, measure and publish Multi-format 3D CAD formts to open Solidworks, Solid Edge, Inventor, IGES, STL, VRML and more. View, measure, explode, cross section, locate parts by name, etc. Publish all or part to 3DF & DWF.
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3D Shop ModelView 

ModelView is an exact 3D model geometry viewer that allows the manipulation of CAD data. This open viewer provides wide access to 3D models in the most popular file formats (dxf, Step, VRML, IGES, CATIA, UG, Pro/E, ACIS, PARASOLID) and data standards (brep, stl, wrl, stp)
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Mesh To Solid for Rhino 

Mesh To Solid for Rhino is a plug-in for Rhino 2.0 and 3.0. This plug-in gives Rhino to ability to convert a mesh into a solid.
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eZ 

Simple, free universal viewer for PDF, CAD, 3D Models, Word, Excel, PowerPoint, digital photos: JPG, GIF, BMP, and more. Open multiple files of different type at once and tile to see them all on your screen at once. View compound .ez presentations.
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quick3D Geometry 

quick3D Geometry is a solution for fast 3D file viewing and geometry conversion. This utility is a must for anyone working with 3D graphics. It supports an expansive range of 3D file formats, major and obscure, and can freely convert among them.
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quick3D Professional 

quick3D Professional is a complete 3D file format viewing and converting solution, and is a must for anyone working with 3D graphics or 3D files. It supports an expansive range of 3D formats, major and obscure, and can freely convert among them.
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