- Command Code - SpyShield PGP encryption plug-in for instant messaging, including MSN Messenger Service. Site provides information about security, PGP encryption, and related technologies.
- CompanyCRYPT server based email encryption - CompanyCRYPT for MIMEsweeper is a server based email encryption for PGP and S/MIME. Encryption and signing happens central and without any interaction of the user. CompanyCRYPT allows virus scanner and anti-spam filter to check encrypted eMails.
- DOS-based PGP Frontends - List of directly downloadable PGP Front-ends for DOS.
- Envelope for Mac - Offers Envelope plug-in for Eudora on the Mac. Also features a download of the demonstration version.
- PGP/MIME - Secure E-mail Clients - Excellent list of email-clients that support PGP/MIME. It includes additional information such as operating system, plugins and PGP/MIME advantages in general.
- PGP Frontends - A collection of local and external links to frontends for DOS, Windows, and other platforms.
- PGPClick - PGPClick is a front-end for Pretty Good Privacy (for Windows)
- Seahorse - Seahorse is a Gnome front end for the GnuPG (Gnu Privacy Guard) file encryption/decryption program. Both English and Japanese support is provided.
