Attached Link: http://home.europa.com/~keithr/

Many programs can do this. I'll wager most of the modeling progs can, and as wyrwulf said, you can do it with Poser. Import your .obj model then export it as a .3ds model. Or you can use crossroads, found at the link provided.

 
~jon
My Blog - Mad Utopia Writing in a new era.