VeraCrypt - VeraCrypt is a free open source disk encryption software for Windows, Mac OSX and Linux.
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Axcrypt - AxCrypt - Password Protect Files With Strong Encryption. AxCrypt is the leading open source file encryption software for Windows.
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Windows BitLocker - This topic provides a high-level overview of BitLocker, including a list of system requirements, practical applications, and deprecated features.
Mailvelope - Mailvelope open source project. OpenPGP in your browser.