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here is a free version of amapi v4:
http://bakhter.com/html/main/amapi4.html

this forum is also good for free 3d software:
http://talkgraphics.infopop.net/1/OpenTopic?a=tpc&s=98519178&f=9601904871&m=6221931595

another one:
http://www.blender3d.org

you may want to check out some of the 3d programs on sourceforge.net
even though it is a full software site they have some 3d software:
for 3d modeling:...