Pyramid is a very general open source Python web framework.

sh (previously pbs) is a full-fledged subprocess interface for Python that allows you to call any program as if it were a function

Clint is a python module filled with a set of awesome tools for developing commandline applications.

A filesystem based wiki

A sexy server logger console in Firebug

Pinax is an open-source platform built on the Django Web Framework. By integrating numerous reusable Django apps and providing starter projects and infrastructure tools, Pinax takes care of the things that many sites have in common so you can focus on what makes your site different.

Google App Engine lets you run web applications on Google's infrastructure. App Engine applications are easy to build, easy to maintain, and easy to scale as your traffic and data storage needs grow. With App Engine, there are no servers to maintain: You just upload your application, and it's ready to serve your users.

Python snippets with REST apis

Plone is a free and open source content management system built on top of the Zope application server.