Taboola - Drive traffic to your site, blog or video, or monetize your site with the largest platform for content recommendation, audience acquisition, and native advertising.

Commento - A fast, bloat-free comments system to foster discussion on your website

Quuu - Quuu is a curated content suggestion platform that connects to your Buffer queue, allowing you to grow a relevant social media following across your entire social landscape.

DISQUS - Disqus is a global comment system that improves discussion on websites and connects conversations across the web.

Written - Written helps content marketers build their audience by licensing content and audience from bloggers.

HashOver - HashOver is a PHP comment system intended as a replacement for services like Disqus.