You could include pass. It is a password manager that is primarily terminal-based, but because it uses standard GPG encrypted files to do so, they are viewable in your file browser and there are graphical extensions for your web browser.
It also uses Git so you can sync it to a remote repository, and Git can be seen as another application that works in a similar manner. It is terminal-based, but there are graphical front ends like gitg.
Okay. Fair enough.