In early April, ProtonMail Bridge introduced Linux support.
And the day before yesterday there were open sources ProtonMail Bridge. The application has passed a full independent code audit by SEC Consult. As always, the results of the audit can be found here.
ProtonMail Bridge is an application for paid users that allows you to use a desktop email client with the ProtonMail secure mail service. IMAP/SMTP protocols and data encryption are supported. Work is possible in graphical and console mode.
Also described security model и usage tips ProtonMail Bridge.
Anyone who is interested has the opportunity to join bug finder.
Previously, CERN opened sources ProtonMail client for iOS and sources all ProtonVPN clients.
Source: linux.org.ru