ProtonMail Bridge for Linux is now out of Beta and is also now open source.
- Name: ProtonMail Bridge
- Homepage: https://protonmail.com/bridge/install
- Reason for inclusion: The only software that allows you to connect your ProtonMail email account to a local email client.
- Is it open source?: Yes
- Source repository: https://github.com/ProtonMail/proton-bridge