Heyoya - Voice comments for websites & blogs
Cusdis - Open-source, lightweight comment system for your website
Huddle - Huddle | The Enterprise Content Collaboration Platform
Commenze - Fully customizable comment sections for any website
Coment - Online comments aggregated in one dashboard
CommentBox.io - Imagine a cleaner, prettier Disqus, but without the ads, tracking, or sharing of personal data.