Tornado

Tornado is a scalable, non-blocking (ASynch) Web Server and Web App Framework written in Python.[1] It was developed for use by FriendFeed; the company was acquired by FaceBook in 2009 and Tornado was open-sourced soon after. http://en.wikipedia.org/wiki/Tornado_%28web_server%29

A lot of the decisions made in designing web.py were also carried over to tornado's web framework (which not coincidentally is also a web.py).

Bill Seitz