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GUN is an open source, realtime, graph database written entirely in JavaScript and built using peer-to-peer algorithms, making it surprisingly fault tolerant and easy to get started with.

API development tool for Web and Mobile developers.

Parse Server is a Parse.com API compatible router package for Node.js/Express.js.

PubNub is the world’s only global Real-Time Network. PubNub enables software developers to rapidly build and scale real-time apps by providing the cloud infrastructure, connections and key building blocks for real-time interactivity. Developers can build real-time apps like live dashboards and data streams, real-time collaboration, 2nd screen synchronization and machine-to-machine signaling for any device. PubNub utilizes a Publish/Subscribe model for real-time data streaming and device signaling and supports all of the capabilities of WebSockets, Socket.IO, SignalIR, WebRTC Data Channel and other streaming protocols. With PubNub, developers can dramatically reduce the cost, complexity and time to deliver real-time experiences. »

CloudBoost can power your app's backend, including data storage, user authentication, real-time notifications, search and more.

Build your app in minutes. No vendor lock-in Deploy BaasBox anywhere you like with SDKs for iOS, Android and Javascript

A secure realtime server, supporting data-sync, RPCs and events

MongooseIM is aimed at large, complex enterprise level projects, where real-time communication is critical for business success. It provides high availability, ease of deployment, development and reliability in production.

ScaleDrone is a push messaging service focusing on security.

Pedestal is a web application framework written in Clojure that aims to bring both the language and its principles to client and server-side development.

Simperium is a service for developers to move data everywhere it's needed, instantly and automatically.