gmail-ro

gmail-ro is a small Windows desktop app that shows several of your Gmail accounts in one place, read-only.

Signs in with Google and asks only for read access to Gmail (gmail.readonly) plus your email address.
Never sends, modifies or deletes mail.
Keeps your mail on your own PC, encrypted. No servers, no analytics.

It is a personal project used by its author and a few invited people. It is not publicly distributed.