GitHub Team Discussions - Now there's more space to talk through your projects 💬
DISQUS - Disqus is a global comment system that improves discussion on websites and connects conversations across the web.
Commenze - Fully customizable comment sections for any website
Commento - A fast, bloat-free comments system to foster discussion on your website
Product Hunt Reviews Widget - Embed and encourage PH reviews into your product
utterances - A lightweight comments widget built on GitHub issues.