Remark42
Self-hosted comment engine that adds threaded discussions to any site with no trackers, no ads, and no third-party scripts loaded on your readers.
No account Comments
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Isso
The classic self-hosted Disqus replacement: a small Python server on a SQLite file that adds comments with no tracking and no third-party scripts.
Cusdis
A tiny open-source comment widget that uses no cookies and needs no reader sign-in, with a self-hosted option and a hosted one for sites that do not want to run a server.