Commento

Disqus looks to make it very easy and rewarding for people to interact on websites using its system. Commenters can build reputation and carry their contributions from one website to the next.

Livefyre’s real-time apps get your audience talking and turn your site into the hub for your community. Bloggers, brands and the largest publishers in the world use Livefyre to engage their users and curate live content from around the social web.

Online comments are broken. Our open-source Talk tool rethinks how moderation, comment display, and conversation function, creating the opportunity for safer, smarter discussions around your work.

It is a lightweight comments widget built on GitHub issues. Use GitHub issues for blog comments, wiki pages and more!

Hosted commenting that's painless to embed, a pleasure to use, and a breeze to moderate. No ads. No Tracking. Just Comments.

It is an open source, lightweight (5kb gzipped), privacy-friendly alternative to Disqus.