A quick google found some interesting leads, albeit _very_ old ones.
- http://www.applerepairmanuals.com/index.php
- http://home.earthlink.net/~gamba2/syslist.html (a ton of dead links; mostly useful to know the filenames of things :<)
- http://home.earthlink.net/~strahm_s/manuals.html (more dead links, yay)
- http://www.retrocomputing.net/info/siti/apple_repair/www.who... (links that actually work! but seems obscure)
- https://www.askbjoernhansen.com/2003/02/11/apple_service_sou... - where I got the earthlink pages from; the paragraph at the bottom was an interesting dead end (seems the LJ account got killed; and it's robots.txt-ed out of existence)
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As for spftp:
I mostly remembering it having tons of old OS update images and diagnostic tools (that were publicly released), as well as (I THINK) a few ROMs (I... think I'm misremembering that bit). Its heyday was pretty much the Classic Mac OS era; there were System 6/7 updates on here etc. I'm not sure when it finally went kaput but I remember poking it in 2008. Unfortunately I learned about it when I had absolutely no free disk space and couldn't archive it :'(
A few months ago I asked someone whose Apple ID was able to login (back in the day any .Mac ID worked, hah) and they said that it was empty. I don't clearly remember whether they said they were seeing a white page or an "Index of /" with nothing underneath, but regardless it seems pretty much gone now.
There are other nice things out there though. One fun query is "hotline kdx". (That's two separate pieces of 90s-era software that used the same P2P protocols, but googling them together is the easiest way to find KDX.) The few servers left are fun - the directories tend to be chaotic messes but patient digging finds cool stuff, like the partial NT4 and OS6 leaks. Shhh :D
