PGP is the name of a program originally written by Phil Zimmermann in 1991. Later versions have been developed and distributed by MIT, ViaCrypt, PGP Inc., and now Network Associates Inc. (NAI). But PGP is also a standard (RFC 2440: Open PGP Message Format). The following is a list of various PGP products that aim at supporting this standard.

PGP : the de-facto standard for email encryption (174)

PGPdisk : encrypt entire disk partitions (2)

PGPfone : make secure telephone calls using a modem or over the Internet (6)

SDKs and programming libraries (12)

The GNU Privacy Guard (GnuPG) : free command line PGP replacement (2)

Tools, shells and plugins (2)

Various PGP derivates (4)