Keepass2: https://keepass.info/

You can configure custom url handlers so that it opens the terminal then ssh right in the server you clicked on.

With a firefox extension, it let you autofill credentials.

Simple one file to backup or sync. Always encrypted. Crossplateform. Free software. Robust. Proven. And a Fugly UI that looks corporate enough for you pointy hair boss.

The only thing missing is that I'm using a cmd otp generator for one time passwords, but it doesn't have keepass support yet.