Nylas N1 – The Extensible, Open Source Mail Client
N1 is an open-source mail client built on the modern web with Electron, React, and Flux. It is designed to be extensible, so it’s easy to create new experiences and workflows around email. N1 is built on the Nylas Sync Engine which is also open source free software. Plugins lie at the heart of N1 and give it it’s powerful features. Building your own plugins allows you to integrate the app with other tools, experiment with new workflows, and more.
License: GPL v3 License