DAZ - Ultra realistic character Poser models plus many other high quality models on sale.
Spacejetters 3D models - 3D sci-fi models including spacecraft, robots, buildings, vehicles etc. Over 100 models available online for immediate download.
Meshfactory - Cinema-quality 3D models in MAX, 3DS, OBJ and Lightwave formats.
Star Trek Meshes - High quality Star Trek meshes and objects for lightwave and 3D Studio. All free for download. Enterprise, Voyager, DS9, Borg..
Sci-fi Meshes - A Community of 3D artists with a focus on teaching 3D Science Fiction. Various meshes available, mainly for 3D Studio Max.
Poser World - Discover one of the largest collections of 3D Poser content on the internet
The Movie Mesh Site - Contains 3D models appearing in various science fiction movies.
2001: A Space Odyssey 3D Models - A superb range of models based on the spaceships that appeared in the Stanley Kubrick film 2001:A Space Odyssey.
Babylon 5 3D models - A comprehensive index of free Babylon 5 3D models.
3D Meshworks - Star Wars downloadable models plus some excellent reference photos.
Zygote - A range of high quality commercial models for sale including animals, architecture, characters, plants, transportation etc.
Baumgarten Enterprises - Baumgarten Enterprises 3D models for Poser and Bryce.
3D Plants - Excellent source of commercial and free 3D plant and tree models.
Amazing 3D Graphics - Custom 3D modeling, plus a wide variety of models for sale.