Now I have to stay awake the whole night just to find out how deep that rabbit hole goes.

Thanks, I guess. 🤣

netPower tried to do this but it usually was a cd with other filler shareware apps crap in addition of one or two websites IIRC.

Not from an ISP, but I have a couple sets of Intel CDs like that from the late 90s. It was presented as a source of technical info (not marketing) but I don't remember precisely what was on it. Maybe some chipset datasheets, maybe some x86 programming info, not sure. It was basically a copy of some portion of their web site with internet links for stuff that was missing.
I think I have a CD like that from AMD also.

The Intel CDs were apparently issued periodically, because I remember mine had a Month/Year sticker on them.

Also, I remember a Creative CD (SB AWE64Gold?) having part of their site recorded.

Internet Explorer 3 Starter kit had a demo containing a handful of offline websites.
(Fun fact: The XP OOBE setup music was originally commissioned for this kit)

vetz wrote on 2020-09-09, 13:02:

EDIT:
Found one here:
https://archive.org/details/out-of-the-net

https://archive.org/details/in-to-the-net
😉

Seriously, though, except to this, I do only remember the early SB16 CD-ROM. It contained a copy of the Creative Website.
Including a few datasheets and a product's catalogue.
Edit : Zup was quicker. 😅

Edit : Some PC repair books contained HTML files and video sequences, too. In the shape of digital data on the companion medium (a CD mainly). By the way, book ware is totally underrated. Just like shareware CD-ROMs. I'm sure they will outlive many big online servers.

This whole idea (offline websites on CD ) really triggers my autism in a good way. I will be partaking in those discs as soon as my build is done.

I am monitoring this thread :]

I have a few Yamaha and an M-Audio disc that has archive copies of their websites circa 1999.