Read through the second link I gave you, it will have links to the modeling program developer sites. Most of them only have trial versions for their full products and there are some that are free.
http://forum.esforces.com/showthread.php?t=28655About halfway down it lists a lot of model programs and where to download or buy them. some of them are free but not all and dont ask for a bootleg copy or a cd key.
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