- Web Server Gateway Interface. It is a specification that describes how a web server communicates with web applications, and how web applications can be chained together to process one request. WSGI is a Python standard described in detail in PEP 3333.
- An isolated Python environment. Allows you to control which packages are used on a particular project by cloning your main Python. virtualenv was created by Ian Bicking.
- The Z Object Publishing Framework. The granddaddy of Python web frameworks.