DISQUS - Disqus is a global comment system that improves discussion on websites and connects conversations across the web.
Sensor Tower - Sensor Tower is a platform for app store optimization and app industry intelligence.
Hyvor Talk - The Best Commenting Platform For Your Website
App Annie - App Annie is a marketing analytics tool available for apps of all kinds. With App Annie, you can track sales, traffic, and a variety of other factors pertinent to monitoring an app's trajectory.
Commento - A fast, bloat-free comments system to foster discussion on your website
appfigures - Cross-platform app store analytics for all of your mobile apps.