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Proton
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Proton Pass Proton Pass is a free and open-source password manager which brings a higher level of security with rigorous end-to-end encryption of all data (including usernames, URLs, notes, and more) and email alias support.
SimpleLogin lets you send and receive emails anonymously via easily-generated unique email aliases.
When an alternative way of pushing notifications is developed. Not yet. And with that dependency, it won't get to fdroid.
it could be put there stripped of that dependency, while an alternative is not available
came back just to mention an app I found in F-Droid, You Have Mail, for the sole purpose of providing e-mail notifications when your client is unable to provide them, as is the case with de-googled Proton users