DISQUS - Disqus is a global comment system that improves discussion on websites and connects conversations across the web.
Product Hunt Reviews Widget - Embed and encourage PH reviews into your product
Hyvor Talk - The Best Commenting Platform For Your Website
Reviews for iOS - Keep track of your App Store reviews
Commento - A fast, bloat-free comments system to foster discussion on your website
Typical Contents - Wirecutter for clothes