Well, some of you might not want to read eMails via Browser (like me) and prefer Thunderbird or other eMail solutions to read and send eMails. ProtonMail Desktop is an unofficial app that emulates a native client for the ProtonMail eMail service.
The app works fine and it’s same secure as reading it in the Browser. However this project is inofficial and you should use it at own risk. The source code is hosted on GitHub. I only miss the ability to lock the client with a password, besides it’s a fine client. Why ProtonMail not official adopts or help the developer here is beyond me, the possibilities are endless.