3d-viewers.com
3D Viewer – ABViewer 7.3
Professional 3D Viewer for reading DWG, STEP/STP, STL, IGES and other 3D file formats. 3D Viewer can print and convert 3D files.
Free to use additional library is required for IGES and STEP/STP formats (7.5 MB):
http://www.cadsofttools.com/download/converter3df.zip
3D file formats supported by 3D File Viewer:
DWG 3D Viewer - AutoCAD drawing file format
DXF 3D Viewer - Drawing Exchange Format
3DS 3D Viewer - 3DStudio, and many others
STL 3D Viewer - Stereolithography file format (ANSI and binary)
IGES 3D Viewer - Initial Graphics Exchange Specification (additional library requests)
STEP 3D Viewer - Standard for the Exchange of Product model data (additional library requests)
OBJ 3D Viewer - WaveFront and many others
GTS 3D Viewer - GNU Triangulated Surface
TIN 3D Viewer - Triangular Irregular Network vector file format
ASE 3D Viewer - ASCI Scene Export
B3D 3D Viewer - Blitz 3D model files
GLM, GLX, GLA 3D Viewer - Ghoul2 (GLM) model files
LMTS 3D Viewer - Pulsar Studio LMTS File Format
LWO 3D Viewer - Lightwave3D object file (6.0 or above)
NURBS 3D Viewer - Nurbs surfaces vector file
NMF 3D Viewer - NormalMapper files
OCT 3D Viewer - FSRad OCT files
PLY 3D Viewer - Stanford Triangle Format vector file
VRML 3D Viewer - Virtual Reality Modeling Language vector file
MCD 3D Viewer - MCD files
MD2 3D Viewer - Quake 2
MD3 3D Viewer - Quake 3
MD5 3D Viewer - Doom3 mesh vector file format
SMD 3D Viewer - Half-Life
BSP 3D Viewer - Quake 3