GPGMail - GPGMail is an open source plugin for Apple Mail.
Cryptomator - When it comes to saving your files on a cloud server, it is important to ensure the security of those files. Keeping your delicate files out of the wrong hands can save you a lot of time and hassle. Read more about Cryptomator.
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
Microsoft BitLocker - BitLocker is a full disk encryption feature included with Windows Vista and later.