3DSMAX - Cult3D
Cult3D's realtime rendering engine is now available for 3D Studio Max. Download the Demo Exporter and see your objects and scenes in realtime. After installing the Cult3D Demo Exporter simply export your scenes and objects to the .co format.

3ds2rib
3DS to RIB

3DStoPOV
converts Autodesk .3DS files to POV-Ray, Vivid, Polyray, or RAW formats.

AMAPI Amapi Studio is a phenomal 3D graphics tool which contains a modeler and many import and export formats. Available for Mac and Windows, it's affordable and very powerful. If you're looking for an easy way to convert your data between various formats and then also modify and edit it, this may be what you want. Demo versions also available for download from TUCOWS (www.tucows.com) around the world.

AutoZ
AutoZ from EMT Software for AutoCAD Release 14 creates a true, 3D solid model from 2D multiview drawings. In many cases, the process is completely automatic.

Avalon's Converters

BSP2WRL
Quake to WRL


CrossRoads
Keith Rules Latest! Still in BETA. Converts almost anything.

Cyberware Conversion Utilities
ply2obj,ply2stl,plyto106,byutodxf,byutomesh

deneb2vrml
Translation of Deneb Robotics formats to VRML (source code)

DOOM to VRML2

DX2VRML
IBM Visualization Data Explorer to VRML

GAMUT-DXm™ Artist Tools for Windows® 95
GAMUT-DXm™ simplifies 3DS MAX® art creation for DirectX® games. It provides accurate conversion of your scenes, including MAX geometry, materials, texture coordinates, bitmap textures, object hierarchy, and animation including Character Studio™'s Biped™ and Physique™ to DirectX® Retained Mode, .X, or .AGT file format. See and Control the final appearance of your MAX artwork in an interactive Direct3D preview window. SRP: $495.00 3DCAFE PRICE: $399.99

GAMUT-PSm™ Artist Tools for PlayStation™
GAMUT-PSm™ speeds up art creation for PlayStation™ games. It provides accurate conversion of your scenes including MAX geometry, materials, texture coordinates, textures and animation including Character Studio™'s Biped™ and Physique™. See and Control the final appearance of your MAX artwork interactively with the preview plug-in, using PlayStation hardware and an NTSC monitor. It includes support for .HMD, .TMD, .TIM, .RSD and .AGT file formats.

GAMUT-N64™ Artist Tools for Nintendo® 64
GAMUT-N64™ simplifies 3D MAX® art creation for N64™ games. It provides accurate conversion of your scenes, including MAX geometry, materials, texture coordinates, bitmap textures, object hierarchy, and animation including Character Studio™'s Biped™ to .NIFF and Biped™ and Physique™ to .AGT file format. See and Control the final appearance of your MAX artwork interactively with the preview plug-in, using a Nintendo 64 and an NTSC monitor.

IDtoPOV
Infini-D to POVRAY converter

InterChange 5.0
Interchange 5.0 performs accurate geometric translation between more than 40 3D file formats while preserving all vital details including colors, UV coordinates, texture map references and
parent-child hierarchical relationships. The new version
incorporates advanced technology allowing users to rearrange
hierarchy, edit pivot points, and view, rotate, move or scale objects interactively.

IvTORay
OpenInventor to Rayshade file converter

Materialize 3D!
Materialize 3D! is a 3D model converter, material / texture editor and polygon processor. Materialize 3D!’s revolutionary interface allows you to process any polygons you desire regardless of model object hierarchies. Create vertex normals, reverse polygon ordering, project textures, and add or modify materials and textures. Imports 3D Studio 3DS, AutoCAD DXF and Direct3D X (DirectX). Exports Persistence of Vision POV, AutoCAD DXF and Direct3D X (DirectX).

PDB to VRML

PolyTrans
PolyTrans performs complete and accurate translations among numerous 3d file formats including SoftImage, 3DS MAX 1.2/2.x, Lightwave, IGES 5.3, OpenFlight, ACIS SAT, Alias .tri, 3DMF, 3DSr4, DEM, DXF, Detailer, DirectX, Imagine, Lightscape, OpenFlight, POV, Pro/E SLP, STL, Strata, RIB, Renderware, trueSpace, VRML 1+2 & Wavefront (+NURBS). All of these formats are also supported by Okino's "NuGraf Rendering System" software. Demos available on WEB site.

ribvrt2
Macromedia RIBS to Renderman RIB

Soft2VRML
SoftImage to VRML

Standard Procedural Database (SPD)
This C language package is used for testing ray tracer efficiency, and now also has the ability to output and convert 3D model data in a wide variety of formats. OBJ, DXF, NFF to many many formats and also provides programs to generate the famous teapot, fractal mountains, trees, etc. Portable C code is provided.

tga2pov2

tga3d.zip
2 tga's to R/B sterio 3D

trueGENE
truespace -> Genesis3D

Wave Object translator
Free from Johnny Ow: Max objects -> Wavefront .obj (Requires 3DSMax v1.1)

wcvt2pov
dxf,3ds,nff,Open-Gl,
pov,psb,raw,tpu,wrl,obj,cob