Blender - Blender is the open source, cross platform suite of tools for 3D creation.
World Machine - Command powerful tools like erosion and advanced colormaps to create terrain heightmaps, meshes, and textures for your game or 3D scene. Download for Free!
Xara 3D Maker - Xara 3D Maker transforms any kind of text, graphic or photo into a 3D logo automatically. You don't need any previous experience to produce professional results.
Terragen - Terragen is a scenery generator, created with the goal of generating photorealistic landscape...
K-3D - K-3D is free-as-in-freedom 3D modeling and animation software.
Prezi - Welcome to Prezi, the presentation software that uses motion, zoom, and spatial relationships to bring your ideas to life and make you a great presenter.