You can download Milkshape for free and use it for 30 days. After that, you have to pay $25 to register it to continue using it. I don't really know about the limitations that Victory mentioned since I only really use Milkshape to convert files. I do everything else in 3ds max. The 3ds max plugins for sfc2 and 3 will only work in versions 3, 4, and 5. Since these are older versions, you may be able to find one cheap.