I found this cool old website for The 7th Guest, The 11th Hour, and T7G3: The Collector. The author is "Bones the Caretaker".
The section of the website for The Collector says "Copyright site-design and written content by Paul van der Meer 2003".
Wait a minute, I know that name! Paul van der Meer is the director of The 7th Guest VR and Project Lead at Vertigo Games!

I don't know how old this website is, but it doesn't exist anymore. Luckily the Wayback Machine captured most of it (missing a bunch of images). Unfortunately the Wayback Machine is a little slow, so navigating around the house in this way is a bit of a pain, and the split screen isn't sized properly for modern screens.
So I made this tweaked version that can be easily self-hosted or downloaded, and it runs much faster.

For the T7G page, start with the t7g/open.html file


If you're lazy, the map page makes it faster to navigate, you could just middle click every link. And here is the help page.



For the T11H page, start with the t11h/open.html file


If you're lazy, the map page makes it faster to navigate, you could just middle click every link. And here is the help page.



There's more too!
https://web.archive.org/web/20041127023227/http://uk.geocities.com/veluan2002/
https://web.archive.org/web/20050410190512/http://www.famvandermeer.demon.nl/links.html
The messageboard was more active than I would have expected
https://web.archive.org/web/20041205203958/http://p198.ezboard.com/ftheseventhguestandeleventhhourfrm1

Restoration and README by Die4Ever, code on GitHub
Sources: https://web.archive.org/web/20041127023227/http://uk.geocities.com/veluan2002/