Chaos Cottage BBS (+44 1736 756633) has (or had) all manner of wonderful resources catering to CP/M and PCW people, and a mirror of Cliff Lawson's archive of files useful for users of old Amstrad PCs. I haven't logged on to it for years, and have no idea if it's still going, although it appears to have a website at chaoscottage.com. Here's a CP/M file list that was current the last time I logged on. Both the CP/M and Amstrad file archives are/were available for f'req on 2:255/94.
CCBBS also has/had lots of resources for non-CP/M people, such as Atari, Amiga, Acorn and PC owners.