Wikipedia: CP/M
- Encyclopedia article, with links to many related topics.
- http://en.wikipedia.org/wiki/CP/M

CP/M - The First PC Operating System
- Information about the history of CP/M and Digital Research. Links to various CP/M resources.
- http://www.digitalresearch.biz/CPM.HTM

S100-Manuals
- An archive of antique software and manuals related to S100 and CP/M hardware and software.
- http://www.s100-manuals.com/

ZCN
- Operating system for Amstrad NC100 Notepad and NC200 Notebook; mostly compatible with CP/M 2.2; descriptions, documents, downloads. Free.
- http://www.ibiblio.org/zcn/

OAK Repository - CP/M Archive (mirror)
- German mirror of the largest public CP/M archive.
- ftp://ftp.mayn.de/pub/cpm/

comp.os.cpm Frequently Asked Questions.
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- http://www.cpmspectre.pwp.blueyonder.co.uk/cpm/cpm_faq.htm

Joe Wein's DRI page
- Some notes about Gary Kildall, CP/M and Microsoft from a former DRI programmer.
- http://www.joewein.de/dri.html

Commercial CP/M Software Archive
- A collection of CP/M software, including source codes and documentations.
- http://www.retroarchive.org/cpm/

Z-Node 51
- Downloads and information for CP/M, Z-systems and Z80 computers. Contains a collection of articles and manuals, too.
- http://www.znode51.de/indexe.htm

CP/M Main Page
- Resource on technical internals, software, utilities, many links; by John Elliott.
- http://www.seasip.demon.co.uk/Cpm/

CP/M 3 patches for Spectrum and Amstrad
- CP/M patches for Spectrum +3 and Amstrad PcW16.
- http://www.cpmspectre.pwp.blueyonder.co.uk/cpm/cpm-indx.htm

CP/M Center
- Information about CP/M and links to various CP/M resources.
- http://www.gaby.de/ecpm.htm

The Unofficial CP/M Website
- CP/M binaries and documentation, including the original source code and manuals.
- http://www.cpm.z80.de

HalBower's Page
- Fixes, programs, libraries, utilities, documents for CP/M and Z-Systems, ZSDOS/ZDDOS, B/P BIOS.
- http://home.att.net/~halbower/

Commodore and CP/M
- Technical description of Commodore's implementation of CP/M Plus in C128, including a couple of tools.
- http://www.herne.com/cpm.htm

Osborne CP/M Library
- Archive containing software and documentation for the Osborne-1 and Osborne Executive.
- http://www.guntersville.net/osborne/

California Digital, Inc.
- A company that still sells CP/M.
- http://www.cadigital.com