Centrifugo 1.0 out – language agnostic real-time (Websocket and SockJS) server
github.com
github.com
I personally believe that Centrifugo is quite distinctive server with some unique features and simple to use. It already helped adopting real-time events on several sites in Mail.Ru Group where I work and several other web projects around the world. It's especially helpful for applications with backend that can't painlessly work with lots of simultaneous connections - for example Django backed web projects. And it's MIT licensed - can help to save several hundred of dollars per month as a replacement of paid services.
Two additional links here, one to documentation – https://fzambia.gitbooks.io/centrifugal/content/ – and second to demo instance on Heroku (use password: demo) – https://centrifugo.herokuapp.com – so you don't need to run your own process to play with (it's on free Heroku dyno with all the consequences).
As usually any feedback much appreciated.