lionet: Erlang, Yaws, and the deadly Tornado - very interesting comparison, as Erlang is often presented as scalable, but it is not often examined as a whole. Yucan and Misultin mentioned later in the article sound very interesting for some purposes, as scalability through the Erlang runtime becomes even easier - and process communication is simply easier to implement than with isolated Python processes. On the other hand, Python is a known quantity for me, so Tornado will certainly find its way into my toolbox.