VeraCrypt - VeraCrypt is a free open source disk encryption software for Windows, Mac OSX and Linux.
ProtonMail - Secure email with absolutely no compromises. Get your free encrypted email account today.
Axcrypt - AxCrypt - Password Protect Files With Strong Encryption. AxCrypt is the leading open source file encryption software for Windows.
Enigmail - Security extension to Mozilla Thunderbird and SeaMonkey
Windows BitLocker - This topic provides a high-level overview of BitLocker, including a list of system requirements, practical applications, and deprecated features.
Skizzle Email - Skizzle is the most secure way to share end-to-end encrypted files through email, backed by blockchain