Supermail

Supermail is a keyboard-first desktop mail client for Gmail. I built it for myself and my family. Triage, replies, reminders and search are each a key or two away, and the week from Google Calendar sits beside the mail.

It's a personal project, not a public service, and it isn't for sale. Mail and calendar data are stored on your own computer. The privacy policy explains exactly what Supermail accesses in your Google Account, where that data is kept, and how to delete it.