Better to go for Blender or a more user friendly fork of Blender, bforartists, better for those who prefer menus rather than keyboard shortcuts.
However as you asked there are options that are not that straight forward.
GMAX is still available, you won't be able to register it though without a hack now unless you have the original key, better to go for Blender or anything else that's free that exports to an up to date fbx.
You can get GMAX into FBX if you can find the third party 3ds exporter and then run that through Autodesks FBX convertor, works after a fashion.
Hexagon which was free at one point will export to 3ds which can be converted as above, no animation though.
3D Crafter Pro - Now Free or was last time I looked, can export to FBX as well as IM.
Autodesks discontinued but free Softimage_Mod_Tool_7.5 will export to FBX but will need updating through the FBX Convertor as the fbx is of 2010 vintage so out of date. Actually pretty similar to 3ds Max.