Alternatives to for all platforms with any license

  • icon

    You can transfer anything you want without storing the data on a server first. You can even stream video files or preview images...

    Open Source Web / Cloud JavaScript

  • JBoss icon


    JBoss is Red Hats Java EE 5-compliant (soon Java EE 6-compliant) application server. It is, as with Red Hat itself, dual-licensed...

    Open Source Mac Windows Linux

  • icon is a lightweight framework for building high performance Realtime Single Page JavaScript applications

    Open Source macOS Windows Linux JavaScript Node.JS

  • WebSocket-Node

    A WebSocket Implementation for Node.JS ( Draft -08 through the final RFC 6455 ) Source code :...

    Open Source macOS Windows Linux JavaScript Node.JS

  • Jetty icon


    The Jetty Web Server provides a HTTP server and Servlet container capable of serving static and dynamic contend either from a...

    Open Source Mac Windows Linux

  • Faye icon


    Faye is a set of tools for simple publish-subscribe messaging between web clients. It ships with easy-to-use message routing servers...

    Open Source Mac Windows Linux JavaScript Node.JS

  • Lightstreamer icon


    Lightstreamer is a server for delivering real-time messages to browser-based and mobile applications, using WebSockets and HTTP....

    Commercial Mac Windows Linux Android iPhone Blackberry ... Windows RT Android Tablet Windows Phone iPad Self-Hosted Blackberry 10

  • Pusher icon


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

    Commercial Mac Windows Linux Web / Cloud Android iPhone ... Android Tablet iPad

  • Jet

    Jet. Lightweight Realtime Message Bus for the Web. Build Realtime Apps now! Jet is a framework for building distributed realtime...

    Open Source Mac Windows Linux Web / Cloud Android iPhone

  • simperium icon


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

    Freemium Mac Windows

  • Primus icon


    Primus, the creator god of the transformers & an abstraction layer for real-time to prevent module lock-in.

    Open Source Mac Windows Linux JavaScript Node.JS

  • greenlet

    greenlet - Lightweight in-process concurrent programming The “greenlet” package is a spin-off of Stackless, a version of CPython...

    Open Source macOS Windows Linux Python C++

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  • eventlet icon


    Eventlet is a concurrent networking library for Python that allows you to change how you run your code, not how you write it.

    Open Source macOS Windows Linux Python

  • gevent

    gevent is a coroutine -based Python networking library that uses greenlet to provide a high-level synchronous API on top of the libev...

    Open Source Mac Windows Linux Python greenlet

  • Nchan icon


    Nchan is a scalable, flexible pub/sub server for the modern web, built as a module for the Nginx web server. It can be configured as a...

    Open Source Linux Redis NGINX

  • Notifyr icon

    Notifyr Discontinued

    Notifyr's cloud push notification service is the easiest way to get started with realtime apps

    Free Web / Cloud

  • Ipê

    An open source Pusher server implementation compatible with Pusher client libraries written in GO

    Open Source Mac Windows Linux BSD

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  • Atmosphere Framework

    atmosphere - Realtime Client Server Framework for the JVM, supporting WebSockets and Cross-Browser Fallbacks Support

    Open Source Linux

  • Mako Server icon

    Mako Server

    The Mako Server is an application server with an API that loosely resembles the Java Servlet API, but where server side web...

    Free Personal Mac Windows Linux

  • SocketCluster icon


    SocketCluster is an open source realtime WebSocket framework for Node.js. SC supports both direct client-server communication (like...

    Open Source Mac Windows Linux JavaScript Node.JS

  • SockJS icon


    SockJS is a browser JavaScript library that provides a WebSocket-like object. SockJS gives you a coherent, cross-browser, Js API which...

    Open Source Mac Windows Linux JavaScript Node.JS Comments

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