Alice ML works on Mac OS X as well, although there was a build issue with "Resource temporary unavailable" that I had to work around. Build instructions are in the README: https://github.com/aliceml/aliceml
You've been there longer than I, but it's nice to see your involvement in /r/sml as well. Thank you!
I've used Alice ML on a couple of projects for a while and didn't want to see it die so I got permission from the original authors to host a mirror on github and keep the bitrot away. I forked from work that Gareth Smith did on bitbucket a few years back (with his permission) that fixed some issues and added features. I'm the only one working on it at the moment but hopefully others join in. It's survived this long!
It's great to see you keeping /r/sml active!