Quos

Securely access the passwords you’ve saved in Firefox from anywhere — even outside of the browser with the redesigned, open-source password manager from Firefox.

Tutanota is the world's most secure email service, easy to use and private by design. It's open-source, private and comes with a free built-in encrypted calendar. Sign up for free to take control of your mailbox.

A list of categorized services and apps that offer end-to-end encryption.