Mac GNU Privacy Guard  
   GnuPG Mac OS X port the open source OpenPGP client.
   http://macgpg.sourceforge.net/

PGP Freeware  
   A security program distributed by MIT that allows users to send information securely using two-key encryption.
   http://web.mit.edu/network/pgp.html

QuickEncrypt  
   A shareware utility provides drag and drop encryption/decryption of files and folders.
   http://www.dejal.com/quick-encrypt/

Warlord Software  
   The maker of Tresor, a file and folder encryption tool for Mac. Offers a newsletter, downloadable demo, product registration, support, and bug reporting.
   http://www.warlord.li

Fortify for Netscape  
   Upgrades Netscape Communicator to 128-bit encryption.
   http://www.fortify.net/download_main.html

Fairly Good Privacy  
   A text-encryption program that can be used to send encrypted messages to recipients. This is considered a low security product.
   http://www.securemac.com/fgp.php