Unrelated to this content (I think), tuwien.ac.at is a domain I have not seen nor thought of in decades. I see that there’s new stuff there too, but does anyone recall why this might have been a well-known domain in the 90s? I feel like I used to regularly read some content or download software from there, probably UNIX stuff.
I had the _exact_ same feeling; when I read your comment I started googling a bit but I came up short. In my case it should probably have been one or some of: MUDs, Linux, Debian, Amiga, shareware, usenet, IRC.
I recognised it because I got into Forth in the last 5-10 years, and the author Anton Ertl was with Bernd Paysan the creator of GForth in the early 90s.
Otherwise, see here for his CV, interests, links which may trigger your memory