Code

Spam Scalpel

Open source spam intelligence engine
License: GPL

PyPLE [License: BSD]

Python Persistent Logic Engine
License: BSD

Vazu for Python

Python class for sending free SMS text messages
License: BSD
Download source

AWSSigner.py

Amazon Web Services request signer for Python. Also works with Alexa Web Information Service (AWIS).
License: None (public domain)
View thread on Amazon Web Services Developer Connection
Download source

US Patent Searches for Firefox

Firefox search plugins for searching patents at the US Patent and Trademark Office.
License: BSD
Add them to your browser
Note: Untested with recent versions of Firefox!