This is an alphabetic list of WSGI servers.

Copypasta of Django's runserver management command, modified to use gunicorn.

gunicorn 'Green Unicorn' is a WSGI HTTP Server for UNIX, fast clients and nothing else.

Awful shared Web host, but nice to know nevertheless.

WSGI middleware - provides adorable object refcount / memory usage stats.

"Werkzeug started as a simple collection of various utilities for WSGI applications and has become one of the most advanced WSGI utility modules. It includes a powerful debugger, full featured request and response objects, HTTP utilities to handle entity tags, cache control headers, HTTP dates, cookie handling, file uploads, a powerful URL routing system and a bunch of community contributed addon modules."

If the response doesn't come back before the time limit, the user is given a response page that asks them to wait. The response page contains Javascript that will re-check the status of the page, and when the page is ready it will reload the page.

"...is an Apache module that provides a WSGI compliant interface for hosting Python based web applications within Apache." Sounds like it's still pretty alpha.

"The nice part about the ocean of components that exists for building Python web frameworks is that the same is true for all of them: they would only require a small amount of glue code."