I used this a while ago on my own insane project. I had a Webdav server and websocketd providing a Web interface to a Linux box.
Even at it's young age (bug reports #5 and #7 were mine), it allowed me to progress a lot further in my project before I needed to write a server designed specifically for the task at hand.
In the end I wrote userserv https://github.com/Lerc/userserv for the one must have feature I needed. I needed logins and responses delivered from a process with the UID of the CookieToken.
So, thanks Joe. Notanos got further because of websocketd and while I'm not currently using it, There's a high chance of me doing so in future projects.