Socket.IO aims to make real-time apps possible in every browser and mobile device, blurring the differences between the different transport mechanisms.
- - Socket.io is the most popular Web-based, Windows, Mac & Linux alternative to UbSub.
- - Socket.io is the most popular Open Source & free alternative to UbSub.
Faye is a set of tools for simple publish-subscribe messaging between web clients. It ships with easy-to-use message routing servers for Node.js and Rack applications, and clients that can be used on the server and in the browser.
Primus, the creator god of transformers but now also known as universal wrapper for real-time frameworks. There are a lot of real-time frameworks available for Node.js and they all have different opinions on how real-time should be done.