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Kleopatra - Kleopatra is a certificate manager and GUI for GnuPG.
Enigmail - Security extension to Mozilla Thunderbird and SeaMonkey
GnuPG - GnuPG is a complete and free implementation of the OpenPGP standard as defined by RFC4880 (also known as PGP).
OpenKeychain - OpenKeychain helps you communicate more privately and securely.
GPG Suite - Use GPG Suite to encrypt, decrypt, sign and verify files or messages.
GPG4Win - GPG4Win is an encryption program for files and emails. The program encrypts emails and files so that they can only be read by those intended to receive them.