Listed is a bloging platform by Standard Notes and offers a Guestbook, check it out
123Guestbook was shut down on July 1st, 2024.
More chat than guestbook, but pretty popular:
Chatbox loads google fonts and possibly cookies/trackers. Click if you're fine with that or took some precautions
memer
8/24/2024Websitehi omg i just checked my guestbook for the first time in a while, I'm looking around your site and it looks SO COOL!!!!! stay safe and awesome dear internet stranger ♥
memer
8/24/2024Websitealso i just now noticed my button wasnt formatted properly LOL, mistake on my end, the memerOnlineButton link should now be sized to be 88x31
sadlylink
8/24/2024Websitethank you so so much!! Stay safe and awesome too, fellow internet stranger! ❤️
P.S. new button will be in the next pull request!