https://github.com/buttercup/buttercup-desktop/releases
https://github.com/buttercup/buttercup-desktop/blob/master/README.md
Buttercup is a password manager - an assistant for helping you store all
of your login credentials. Buttercup helps you keep your accounts safe
and assists you when you want to log in - all you need to do is remember
just one password: your master password.