GoVisually - GoVisually empowers creative teams to deliver better designs, by providing a simple way to review and approve designs quickly and easily
DISQUS - Disqus is a global comment system that improves discussion on websites and connects conversations across the web.
Ziflow - Online Proofing software from Ziflow keeps teams connected and collaborating by providing a single source of truth for creative review and approval.
Commento - A fast, bloat-free comments system to foster discussion on your website
Ashore App - Built for agencies and creatives, Ashore is an automated design approval system combined with approval workflow software. Get started for free!
Commentbox - Commentbox is a jsf component that allows quick realization of a comment functionality