ProtonMail - Secure email with absolutely no compromises. Get your free encrypted email account today.
ElectronMail - Unofficial desktop app for ProtonMail and Tutanota end-to-end encrypted email providers
Enigmail - Security extension to Mozilla Thunderbird and SeaMonkey
Mailvelope - Mailvelope open source project. OpenPGP in your browser.
Thunderbird - Thunderbird is a free email application that's easy to set up and customize - and it's loaded with great features!
APG - Android Privacy Guard (APG) is a free and open source application for ...