Excellent list of email-clients that support PGP/MIME. It includes additional information such as operating system, plugins and PGP/MIME advantages in general.

Seahorse is a Gnome front end for the GnuPG (Gnu Privacy Guard) file encryption/decryption program. Both English and Japanese support is provided.

List of directly downloadable PGP Front-ends for DOS.

A collection of local and external links to frontends for DOS, Windows, and other platforms.

Offers Envelope plug-in for Eudora on the Mac. Also features a download of the demonstration version.

SpyShield PGP encryption plug-in for instant messaging, including MSN Messenger Service. Site provides information about security, PGP encryption, and related technologies.

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.

PGPClick is a front-end for Pretty Good Privacy (for Windows)

PGPmail provides SSL and PGP/GPG encrypted secure offshore webmail from the privacy haven of Belize.