Proxy Server

Server that layers some type of info/interaction on top of a 3rd party's "base".

WikiProxy, WikiMail, Annotation Systems

typically really talking about Caching Proxy Server

http://en.wikipedia.org/wiki/Proxy_server

Les Orchard:PersonalWebProxy

The Universal Inbox could be thought of this way as well.

Ian Bicking identifies some issues that come up in a WSGI context.

Python-based Proxy Server-s http://xhaus.com/alan/python/proxies.html

• also http://mitmproxy.org/