giscus is described as 'A comments system powered by GitHub Discussions. Let visitors leave comments and reactions on your website via GitHub!' and is a Comment Platform in the category. There are more than 25 alternatives to giscus for a variety of platforms, including Online / Web-based, Self-Hosted solutions, Wordpress, SaaS and Blogger. The best alternative is Isso, which is both free and Open Source. Other great apps like giscus are Disqus (Freemium), Commento (Paid), ReplyBox (Paid) and utterances (Free, Open Source).
HTML Comment Box is an easy wasy for your website to receive, and optionally approve/delete comments from your visitors. Just paste the html comment box code near the bottom of your web page's HTML source, and voila!
Docuss is a comment/discussion/collaboration system for your website or web app, based on Discourse. Features: - Add comments or full discussion topics to your web pages - Create menus or buttons with attached comments/discussions - Host it yourself or have it hosted for you