Apple App Analytics - Apple's very own iTunes Connect App Analytics
CoFoundersLab Discuss - Where 300,000+ entrepreneurs get their questions answered
My Motiff - Allowing you to stay connected in realtime
DiscussBot - Telegram's web comment widget
Usage Analytics in appFigures - Track usage for your app along side downloads, ranks & more
GitHub Team Discussions - Now there's more space to talk through your projects 💬