Many here might have heard of MagiCMac. It's an emulator of sorts, but the way I understand it, it is more like a VM. Especially up to version 6.20, since that is the last version that runs on 68K-architecture. Since both contemporaneous Atari 16/32 and Macintosh lineups are 68K, Atari ST programs run natively as far as the CPU is concerned.
To give a bit of background; MagiC or MagiX! as it was initially known, is an OS replacement for TOS that was very popular, especially in Germany. It was coded in 68K assembly and looked and ran better than TOS. Atarians generally fall into two camps; MiNT users or MagiC users with both equally dabbling into TOS when necessary. Again, this is a rough generalization. There were three platforms - Atari, PC (MagiC PC), Macintosh (MagiCMac) - that had reached version parity by 6.10 and apart from MagiCMac, 6.20 was the last version that was released.
Subsequent versions of MagicMac were called MagicMacX and, as the name implies, required OS X. This was the longest supported Atari-related product from ASH. MagicMac's "successor" is Atari X, an open source product worth checking out: GitHub - th-otto/AtariX.
As a side note, ASH still sells MagicPC 6.20 and it runs fine under Windows 11 despite being designed in the Windows 95/98 era.
MagicMac is German, however, good folks in the Atari community have painstakingly translated everything into English but some installation steps are in German, but if you've installed classic Macintosh software, it should be intuitive.
Also, as far as I know, MagicMac only runs on real hardware. I have not been successful with emulators. Following examples have been performed by my trusty Mystic Colour Classic.
This should be intuitive. Select installation location and click "Installieren".
Choose your location and press update. That should take care of it.
It's the same process as in the German but the order is important.