Stream Framework is a Python library, which allows you to build news feed, activity streams and notification systems using Cassandra and/or Redis. The authors of Stream-Framework also provide a cloud service for feed technology:

Facebook open graph api implementation using the Django web framework in python

Snaptastic is a Python library which helps with mounting and snapshotting EBS volumes on AWS.

Tool to automatically create a development database for local development by sampling your production database. It maintains referential integrity by looking up the dependencies for the selected rows.