Enigmail is a data encryption and decryption extension for Mozilla Thunderbird and the SeaMonkey internet suite that provides OpenPGP public key e-mail encryp…

Mailvelope is a free software for end-to-end encryption of email traffic inside of a web browser (Firefox or Chromium) that integrates itself into existing we…

Tutanota is an open-source end-to-end encrypted email software and freemium hosted secure email service.

Kolab Now is a web-based email and groupware service, based completely on free and open-source software.

ProtonMail is an end-to-end encrypted email service.

Yandex.Mail is a free email service.