The following are disk images for the SIMH (simh.trailing-edge.com) multi-system simulator)'s
Altair simulator. They aren't compatible with the emulators I use.
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Z3PLUS	Full release of Z-System based on CP/M 3Full release of Z-System based on CP/M 3
NZCOM	Full release of Z-System based on CP/M 2.2
ZSDOS	CP/M 2.2 with ZSDOS as BDOS replacement
Z80DOS	CP/M 2.2 with Z80DOS as BDOS replacement
DOSPLUS	Operating system CP/M compatible replacement for both CCP and BDOS
MPM		Operating system with support for 8 banks, multi-user and multi-programming
CPM3	
PCPM	Personal CP/M
CPNET	CP/NET 1.2 and CPNOS 1.2 server based on MP/M, client based on CP/M 2.2
CPM2	CP/M v2.2 with add'l utilites