OneSignal - Customer engagement platform used by over 1 million developers and marketers; the fastest and most reliable way to send mobile and web push notifications, in-app messages, emails, and SMS.
Firebase - Firebase is a cloud service designed to power real-time, collaborative applications for mobile and web.
Warply - A mobile marketing toolbox that powers up monetization, loyalty and engagement.
CloudBoost.io - One Complete Database Service that does data-storage, search,real-time and a whole lot more.
Pusher Beams - Send push notifications programmatically at scale
Supabase - An open source Firebase alternative