DISQUS - Disqus is a global comment system that improves discussion on websites and connects conversations across the web.
Higher Logic - Private, secure online communities that stimulate conversation and ignite engagement.
Answerbase - Add a Q&A system to your website in just minutes, with Answerbase's powerful question and answer software for online communities and customer support.
Vanilla Forums - Build an engaging community forum using Vanilla's modern cloud forum software.
utterances - A lightweight comments widget built on GitHub issues.
Hivebrite - Hivebrite is an all-in-one community management platform.