1 Free and Open-source Mail client Apps for macOS (Intel and Apple Silicon)

1- ElectronMail

Unofficial open-source ProtonMail Desktop App

ElectronMail is an Electron-based unofficial desktop client for ProtonMail. The app aims to provide enhanced desktop user experience enabling features that are not supported by the official in-browser web clients. It is written in TypeScript and uses Angular.

Read about ElectronMail 's features, license, platforms, and more.