Pusher Beams - Send push notifications programmatically at scale
Apple App Analytics - Apple's very own iTunes Connect App Analytics
Truepush - Unleash limitless possibilities with Truepush and save up to $600 monthly. Free up to 10K Subscribers on all features.
Poltio - Create and share questions, get answers.
PushOwl - Re-engage website visitors with push notifications
My Motiff - Allowing you to stay connected in realtime