[http://www.gnupg.org GNU Privacy Guard] is a GPLed implementation of the PGP encryption protocols. Also known as "GnuPG" or "GPG".
A [http://www.amk.ca/python/code/gpg Python/GnuPG interface] exists, but is no longer actively maintained. Please record comments, recipes, and patches on this Wiki page. If anyone wants to maintain the module and needs a CVS repository to store the code, just ask for write permission to the [http://www.sf.net/projects/pycrypto/ pycrypto project on SourceForge].