My second @firstname.lastname@example.org OS app, Obliviate, is now live on AppCenter.
And if you are on another distro, you can always download the Flatpak.
If you need your passwords on another OS, say on your phone, then you can visit http://obliviate.app, a web app that will also give you the same password based on the same inputs.
It is not connected to the desktop app, but still works because both use the same algorithm.
A generalist Mastodon instance with a nice domain name. Running on Glitch Social's fork with a custom theme!