
Site:
http://blender.org/cms/Home.2.0.htmlI've downloaded it and as a noob to modelling it took reletively little time to learn the program with the help of this wikibook. http://en.wikibooks.org/wiki/Blender_3D:_Noob_to_Pro
Since it's open source, you can download plugins and python scripts to run inside the app. u can also make ur own plugins using python or make changes to the source of the app. http://www.python.org
Hopefully sum1 who knows how will make a halo pc/ce/xbox/2 plugin that will be useful for modeling for halo.