I created a 3-D model that is available as a FBX file. Which software helps me modify it to not only be printable but to also stand upright? In other words, which software helps me simulate how it would react in a real life situation and also modify it in the same application till it's suits my design as well as stability wishes.
As far as I know, Blender can both import .fbx and do a center of mass calculation (though there appears to be some concern that this is accurate for hollow objects only.