Check out Cyclops:
http://thaines.net/content/view/39/7/Cyclops is simply a bunch of 'little' tools which when combined allow
you to create 3D models from photographs. This is not some integrated
system - its a mess, but its the only free tool available for doing
this right now. (That I know of, if anyone knows otherwise please
e-mail me.) Its of primary use to researchers in the area and other
computer scientists who are curious. And anyone who thinks that making
3d models out of photos is rather cool, and is therefore willing to
climb quite an erratic learning curve to do so
