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Did you try tornadio2?

This is the first time I've heard of tornadio2; it turns out there is a list of other socket.io server implementations at https://github.com/learnboost/socket.io/wiki/

AFAIK it was released after we settled on Node.js.

We use Tornadio2 along with Pika (with the IOLoop sharing) for an internal project and it's been great.