OpenPGP Webmail is a set of PHP scripts which allows anonymous Web users to send encrypted email to anyone with PGP or GPG keys. It is designed to run over SSL, and has a key search facility built in. GnuPG is required to do the encryption. The project is now abandonware. Anyone can take it over if they like.
keyanalyze is designed to analyze keyrings in the OpenPGP format (PGP and GnuPG). It looks at properties of connectivity to generate strongly-connected set analysis, as well as some arbitrary statistics including a "mean shortest distance" calculation to show the most connected keys. This code is also used to create a report based on an extremely large keyset once per month.
The SLAN project is focused on developing a flexible open source Virutal Private Networking system, primarily for securing Internet uplinks which use broadcast media such as 802.11 wireless links or public/shared ethernets. The system is flexible enough to support traditional VPN applications as well. As well as featuring an open design and strong security, the SLAN project hopes to eventually provide support for all major computing platforms.
Random Tools is a collection of tools you can use to collect random data and feed it to the kernel random pool. At present, only collecting from your sound card (/dev/dsp) is supported, but adding support for other sources of randomness (sometimes referred to as "entropy sources" or "random generators") should be easy. You can test the input with FIPS 140-2 tests before writing it to /dev/random.
Pine Privacy Guard is a small Perl script used to interface Pine and GnuPG for the secure exchange of email. It allows Pine users to conveniently encrypt, decrypt, clear-sign, and verify clear-signed email. Other features include the secure storage of secret key passphrases during a session, alias support, simple installation, and compact, well-documented code.
JHBCI is JCA/JCE cryptographic service provider for Java. It is useful for building HBCI home banking applications (clients and servers). JHBCI implements all relevant "RDH" crypto algorithms for the German Homebanking Standard HBCI Version 2.2, such as DES, RSA, ISO9796-1:1991-Signature, and RIPEMD160-MessageDigest.