This is a WSGI server designed to help you dispatch to multiple other WSGI handlers.
Essentially it is a virtual hosting WSGI server. Hostnames (although it could be any HTTP variable) are used to map to python modules which are then imported and dispatched to.
There is a simple plugin architecture for the module mapping which allows control of exactly how the dispatch it done.
WooMe use this in their development environment to make each and every cloned copy of woome in development available to staff and to automated browser testing.