@vkc I wrote my own self hosted one because I was frustrated that I could not find any which would disallow bots without requiring an account, bigtech tracking, or requiring manual approval of each comment.
Mine doesn't support moderation review/ manual approval yet, it just uses my bot deterrent and that's it. It can notify of new comments via email, and has an admin panel which allows deleting comments.
It relies on JS / WASM for the bot deterrent.
Source code: https://git.sequentialread.com/forest/sequentialread-comments
You can test it out on my blog here: https://sequentialread.com/now-with-comments/