Image to solid

Hi All

Has anyone got a, preferrably free, list of programs to get from an image to
a 3d solid. There seems to dozens of close fits on the net, but most of them
are half-baked. I'd like to know if anyone has found something good.

I'm wanting to take a picture, say an antelope, and go from that to a
cropped file, and then add text onto it to produce a medal or coin at the
end of it.
I'm happy to end at a .stl file.

Also, I have not found a simple program that allows an image to be cropped
in a round format, but being able to accurately set the diameter and origin.

Regards
Roland


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