1. Realtime Messaging is a cloud based message broker. Enabling developers to build cross-platform apps that require realtime communication

  2. Bastly is an open-source real-time backend for apps.

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

  4. Simply better realtime.

  5. Save time, eliminate mistakes, and get paid faster with Quoter, the cloud-based quoting platform.

  6. SignalR is a server-side software system designed for writing scalable Internet applications, notably web servers.

  7. 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.

  8. a lightning fast realtime data-store that connects browsers, smartphones, backends and the IoT - complete with realtime search, publish-subscribe and request-response

  9. An open, scalable realtime engine for Node.js