1. Firebase is a cloud service designed to power real-time, collaborative applications for mobile and web.

  2. PubNub is a real-time messaging system for web and mobile apps that can handle API for all platforms and push messages to any device anywhere in the world in a fraction of a second without having to worry about proxies, firewalls or mobile drop-offs.

  3. API development tool for Web and Mobile developers.

  4. Pusher is a hosted API for quickly, easily and securely adding scalable realtime functionality via WebSockets to web and mobile apps.

  5. OneSignal is a free push notification service designed for mobile apps and games.

  6. Self-hosted Firebase.

  7. restdb.io lets you create databases and REST APIs quickly. Development databases are free. Powerful web-based and mobile-friendly data management.

  8. An open protocol for per-user storage OWN YOUR DATA

  9. One Complete Database Service that does data-storage, search,real-time and a whole lot more.

  10. Mobile marketing solutions across all major mobile platforms.

  11. Build, test, and monitor usage of your mobile apps

  12. Realtime application framework (Node.JS server)