Slack with your Users - Speak to your app's users entirely within Slack
Appstark - Appstark is a mobile app feedback and support software.
Conversity - Easiest way to manage Facebook Messenger chats
Pulse Insights - Pulse Insights is a micro survey platform helps clients gain insights from their web and mobile sites.
Avochato - Text messaging for your business.
AppsMonk - Real time in-app chat for mobile applications.