facti.net

Modelling

Wings 3d

A nice, fast, and simple to use 3d modeler available for Linux, Windows, and Mac OS X. I found the interface to be very intuitive and have built several models with it, including the dune buggy at right.

Additional samples from others can be seen at the wings3d gallery.

Blender

A more complex and powerful suite of 3d tools.

Browsing

Want to see space, maps, locations in 3D? Use these.

Google Earth

Browse the earth and the universe in 3D. (nyt)

Items marked with (nyt) indicate I have not yet tested it. I've heard it's good (so it has made it on the list) but have not yet tested it myself.