simple question

Hi, im just looking for a free program for my mac, that alows you to pose 3d models that i downloaded, basic. and easy
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please help

hmmmm... if you can use 3d max, there is some character rigging and biping with 3dmax help. its the basic foundation, you must have a basic knowledge with these. ( rigging, biping) otherwise it will be very hard for you to understand this things.
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interior designer / 3d visualizer

http://www.sharecg.com/pf/rpadc2002
http://www.pixila.com/portfolios/portfolio/?artist=200
http://rpadc2002.cgsociety.org/gallery

Do you want to pose them or animate?
I know that there is poser for mac, it is designed for posing but it is not free.
You can also try blender 3d. They have a mac version it is free and you can do a lot of stuff in it.