I am. I've been working on it for 3.5 years. It's open source and it's called Comment Castles [0]. I am currently in the process of changing the name to Comment Castles, the main instance is currently at the old name [1].
All the features work with front-end JavaScript turned off.
I am currently wrapping up the OAuth 2 server implementation so that we can have third party apps (no API fees!).
After I wrap up some remaining features I am going to move everything to commentcastles.org and forward the old site there.
It's currently text only (emojis allowed).
I do want to build good custom search but haven't really started on that task yet.