The website says that he uses:
"Xitami web server, because it's the only one that does no caching at all, so the website is always served fresh from the floppy."
Source: https://web.archive.org/web/20220120092324/https://old.bigca...
"Xitami web server, because it's the only one that does no caching at all, so the website is always served fresh from the floppy."
Source: https://web.archive.org/web/20220120092324/https://old.bigca...
Even more surprising, his page isn't just pretty, it is functional! You can get a copy of the demo for Wolfenstein 3D off of the site (supposedly, I did not try).