Tornado Web Server
Tornado is an open source version of the scalable, non-blocking web server and tools that power FriendFeed. The FriendFeed application is written using a web framework that looks a bit like web.py or Google's webapp, but with additional tools and optimizations to take advantage of the underlying non-blocking infrastructure.

Tornado has been tested on Python 2.5 and 2.6.
Non testé sur Python 3 donc. Ca fait longtemps qu'on n'en a pas entendu parler d'ailleurs.