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Kleopatra - Kleopatra is a certificate manager and GUI for GnuPG.
VeraCrypt - VeraCrypt is a free open source disk encryption software for Windows, Mac OSX and Linux.
Enigmail - Security extension to Mozilla Thunderbird and SeaMonkey
OpenKeychain - OpenKeychain helps you communicate more privately and securely.
Windows BitLocker - This topic provides a high-level overview of BitLocker, including a list of system requirements, practical applications, and deprecated features.
PGP Tool - PGPTool allows you to encrypt and decrypt files. It's free and easy to use.