Last four months I was developing Centrifuge: https://github.com/FZambia/centrifuge - as I wrote in its description - "Light and simple open-source platform for real-time message broadcasting in your web applications".

It's written on Python using Tornado, ZeroMQ, SockJS, MongoDB (or PostgreSQL).

And at this stage of developing I need your crytics, guys. At the moment there are some docs - https://centrifuge.readthedocs.org/en/latest/ and video screencast with relaxing music - http://www.youtube.com/watch?v=RCLnCexzfOk (don't forget to turn subtitles on). And if you are from Russia there is article about it here - http://habrahabr.ru/post/184262/ .

If you are interested, please, look at it and I really appreciate any feedback.