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CP/M development was started from Digital Research in 1975.
There exists several versions for different processors, started for the Intel 8080 and the compatible processors like Zilog Z80 and the Intel 8085, later for the Intel 8086, Zilog Z8000 and also for the Motorola 68000.
My interest is focused on the Intel 8080 versions:
CP/M 1.4, CP/M 2.0, the well known CP/M 2.2 and the better, but less common CP/M 3.0. There also some variants like ZSDOS, QP/M, Personal CP/M a.s.o. these are useful, but they are not "mainstream".
You can find a great software repository at Gaby's "unofficial CP/M" site.
Also, there is a very good place to find programming languages at retroarchive's file collection.
Very important is transferring files from real CP/M computers to newer systems (aka PC's or Mac's ;-)). One of the most famous transfer programs is Kermit from the Columbia University. To get it running with CP/M, look here.
Currently I am working on a "Norton Commander" clone for CP/M, see here, because it isn't very convinient to use PIP to copy files (and all these other ancient commands like ERA, REN, STAT etc) ...
Meanwhile I digged out a beautiful ccp replacement:
New Generation Systems Microshell 2.0,
I spent this software a whole new page here.
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