Tornado comes with limited support for WSGI. However, since WSGI does not support non-blocking requests, you cannot use any of the asynchronous/non-blocking features of Tornado in your application if you choose to use WSGI instead of Tornado's HTTP server. Some of the features that are not available in WSGI applications: @tornado.web.asynchronous, the httpclient module, and the auth module.
in other words: WSGI sucks
EvServer is a lightweight http server, created especially to host python WSGI applications. Additionally, it supports little known Asynchronous WSGI extension, which was suggested by Christopher Stawarz. Using this extension it's possible to create an output html response in many data chunks, without blocking the main server process while your application waits for external resources.
Comet the WSGI way.
SoS is just a Python based SMTP server that can receive emails, process them using handlers based on routing regex, and then relay results out again using templates. All of this is done without using alias files, m4 macros, pipes, weird protocols, or duplicate processing of the emails.
one simple pythonic SMTP server
A Twisted-based publish/subscribe messaging server that uses the STOMP protocol