Mailplane is a Gmail client for the Mac. It’s a single-site web browser, $29.95.
ToothFairy is an alternative to AirBuddy. Does less, but costs less, and good enough for me. Included in SetApp.
https://c-command.com/toothfairy/
And Paletro provides a command palette for any application. Invoke Paletro with a hotkey, and it calls up a text bar, into which you type the name of any menu command in an application. Alfred will do the same with a workflow, or you can use Shift-Cmd-/. But I like Paletro. It’s $6.99, and included in SetApp.
I learned about Paletro on this forum.