Attached Link: http://cg.cs.tu-berlin.de/~ki/3del_1419_hard_mac.html

Walther, maybe you could have a look at this address and find out what is good for MAC users (there are some links). Also do not hesitate to go to google.com and write "fractals+3d+voxels" in the search field. I think you know better then we what MAC users needs and really can use. Would nbe nice if you find some MAC addresses. Thanks:-)