Open source disk encryption with strong security for the Paranoid
...This enhanced security adds some delay ONLY to the opening of encrypted partitions without any performance impact to the application use phase. This is acceptable to the legitimate owner but it makes it much harder for an attacker to gain access to the encrypted data.
All released files are PGP signed with key ID=0x680D16DE, available on key servers and downloadable at https://www.idrix.fr/VeraCrypt/VeraCrypt_PGP_public_key.asc
VeraCrypt can mount TrueCrypt volumes. It also can convert them to VeraCrypt format.
Documentation: https://www.veracrypt.fr/en/Documentation.html
FAQ : https://www.veracrypt.fr/en/FAQ.html
DiskCryptor - fully open solution to encrypt all partitions, including system. The program is a replacement for proprietary DriveCrypt Plus pack and PGP WDE.
PGP, short for Pretty Good Privacy, is a public key encryption package; with it, you can secure messages you transmit against unauthorized reading and digitally sign them so that people receiving them can be sure they come from you.
SSMTP,nameed after Secure SMTP,is a library to enable developers to provide secure SMTP capabilities within their applications. It is written in C/C++,expects to implement full support of SMTP, MIME, S/MIME, and PGP.
myPGP is an experimental PGP clone. It can be used to encrypt, decrypt and sign messages in a public key system, as well as to manage the keyrings. It's main goal is to fully implement the standard OpenPGP.
The LTC Encryption program is designed to implement the cryptographic functions contained in the libtomcrypt.a library. It works similar to PGP, but does not use the OpenPGP standards.
GAIM encryption plugin using GPG (PGP clone). It works transparently and smoothly. Automatically establishes secure conversations with other enabled users, passes keys (if enabled) and eventually will allow you to specify your own keys to use.
Enkript is an user-friendly file ciphering program. It uses the popular algorithms MD5 and IDEA (used in PGP, for example). It detects automatically whether to encrypt or decrypt the given file, and badly deciphered files.
...Could be used in a company so that your accountant can be in contact with the salerperson in a secure way, without you needing to tell the accountant everything about PGP