codecrypt is a GnuPG-like program for encryption and signing that uses only quantum-computer-resistant algorithms.
The NTRU public-key cryptosystem provides a Java implementation of the NTRUEncrypt and NTRUSign algorithms. Both algorithms are considered safe against quantum computer attacks. A C port of NTRUEncrypt is available, as well.
Signature is a PHP 5 class that provides a unique signature for a specific visitor. It requires PEAR Crypt HMAC2 and PEAR Net UserAgent Detect.
A media library management system for obsessive-compulsive music geeks.
A CalDAV Web client.