There are a couple MacUsers who frequent the site from time to time. Note that there is also a Macintosh forum for general "stuff" about the Mac platform. Don't know for sure but looking at the download numbers for PC Only VS Mac Only versions of the same file it appears that about 1/3 are Mac downloads. Not sure if that's "scientific" but is interesting. As for OpenGL well, it's an "Open" source code. That means that are are several "versions" of it. I'd download the latest from Apple & trash the others (or store them on your desktop in a seperate folder until you know you don't need them).