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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!
Enigmail - Security extension to Mozilla Thunderbird and SeaMonkey
Homomorphic encryption - Homomorphic encryption by IBM allows you to perform computations on its encrypted data without first decrypting it.
OpenKeychain - OpenKeychain helps you communicate more privately and securely.
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.