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Kleopatra - Kleopatra is a certificate manager and GUI for GnuPG.
GnuPG - GnuPG is a complete and free implementation of the OpenPGP standard as defined by RFC4880 (also known as PGP).
Enigmail - Security extension to Mozilla Thunderbird and SeaMonkey
OpenKeychain - OpenKeychain helps you communicate more privately and securely.
PGP Tool - PGPTool allows you to encrypt and decrypt files. It's free and easy to use.
Autocrypt - Convenient End-to-End Encryption for E-Mail