Lighting design software

Could anyone recommend any lighting visualisation software that I might be able to use either free or with a group license for using as an educational tool in classes? I’m wanting to use it with students to create their own lighting designs. I was thinking of Capture Polar but it could work out to be very expensive for a group license. Something that would be compatible with the Smartfade ML would be great. Any help you could offer would be greatly appreciated. Thanks, Jason