Django - The Web framework for perfectionists with deadlines
Flask - a microframework for Python based on Werkzeug, Jinja 2 and good intentions.
web2py - Web2py is an open source web application framework.
Tornado - A Python web framework and asynchronous networking library, originally developed at FriendFeed
Bottle - bottle.py is a fast and simple micro-framework for python web-applications.
ArcGIS API for Python - Perform visualization, analysis and management of your web GIS using a powerful, modern and easy to use Python API.