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Kleopatra - Kleopatra is a certificate manager and GUI for GnuPG.
GPGMail - GPGMail is an open source plugin for Apple Mail.
Enigmail - Security extension to Mozilla Thunderbird and SeaMonkey
ProtonMail - Secure email with absolutely no compromises. Get your free encrypted email account today.
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.