Remark42 is a self-hosted, lightweight, and simple (yet functional) commenting system, which doesn't spy on users. It can be embedded into blogs, articles or any other place where readers add comments.
Check out demo.
Social login via Google, Facebook and GitHub
Multi-level nested comments with both tree and plain presentations
Import from Disqus
Moderator can remove comments and block users
Voting, pinning and verification system
List of recent comments from all posts
Export comments to json and automatic backups
No external databases, everything embedded in a single data file
Fully dockerized and can be deployed in a single command
Clean, lightweight and fully customizable UI
Multi-site mode from a single instance
Integration with automatic SSL