[everforward]

The browser is the obvious option. Firefox and Chrome both implement ways to save passwords in the browsers. I believe Firefox has a service to sync them, Chrome may too (I don't use them, so I don't know).

They could reasonably tie in to whatever Office-suite you use (GSuite, Office 365).

In the enterprise, it could be part of a larger "credential management suite" product managed by security. Allow syncing and auditing of credentials, like "when was the last time this cred was changed?" with some kind of automation to generate and push a new credential when need be.

From the outside looking in, a basic credential manager doesn't seem complex enough to be a standalone product.