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Firebase - Firebase is a cloud service designed to power real-time, collaborative applications for mobile and web.
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.
Supabase - An open source Firebase alternative
Higgs.IO - A high performance (Async), message oriented network library built for real time systems.
Etebase - Etebase makes it easy to build end-to-end encrypted applications by taking care of the encryption and its related challenges.
SignalR - SignalR is a server-side software system designed for writing scalable Internet applications, notably web servers.