Kleopatra - Kleopatra is a certificate manager and GUI for GnuPG.
PGP Everywhere - PGP Everywhere is an iPhone / iPad app that allows you to utilize the security of PGP encryption anywhere you type, in almost any app!
YAATA - YAATA app offers features that let you send multimedia files such as images, videos, audio, and GIFs, etc.
DESlock+ - DESlock+ is a suite of encryption instruments designed to shield in opposition to unintended storage platforms like the loss of a USB stick or computer and to allow relaxed collaboration and information sharing within the boundaries.
Enigmail - Security extension to Mozilla Thunderbird and SeaMonkey
KETS Quantum Key Distribution - KETS Quantum Key Distribution service is a utility that allows future-proof, quantum-safe communications at ultra-low power in a low-cost Quantum Key Distribution chip.