What can be used as a cross-platform 3D viewer for OBJ (Wavefront) files?

The viewer should be cost-free and support at least Mac OS X and Linux, and if possible also Windows.

The best solution seems to be currently the program “GLC Viewer”. It is very easy to use, works really good and seems a good, clean software. The best thing is, it is open source. Its website: http://www.glc-player.net/.

Installation for Ubuntu 9.10 (Karmic):

1. Make sure you have QT 4.5 installed.
2. Go to http://ftp2.srv.endpoint.nu/pub/software/getdeb/ubuntu/pool/apps/g/glclib/ and download the glclib Debian package for your architecture.
3. Install glclib. For example: dpkg -i glclib1_1.2.0-1~getdeb1_amd64.deb
4. Go to http://ftp2.srv.endpoint.nu/pub/software/getdeb/ubuntu/pool/apps/g/glc-player/ and download the glc-player Debian package for your architecture.
5. Install glclib. For example: dpkg -i glc-player_2.1.0-1~getdeb1_amd64.deb

Evaluated alternatives include:

1. TNG viewer. A free viewer that can open OBJ files but is only available for Windows and Mac OS X.
2. Deep Exploration. A very good viewer, but not cost-free and also not available for Mac OS X and Linux.
3. Blender. Not just a viewer but a cross-platform 3D authoring tool. And therefore it is too complex to use as a viewer, also since it uses strange (umh … innovative) GUI concepts.