I used to use this, and then I moved to a real password manager. Like seriously, this doesn’t hold a candle to an actual well-engineered password manager. I use Keepass right now, with MacPass and Keepassium; both excellent apps.
You would push a key shortcut, then based on the window title of whatever window has focus, it would simulate key presses into it. So I could type secure credentials into any program on my computer with one key stroke.
It works and is better than placing password in clipboard and than "xdotool type $pass". Likely worse than proper integration with password consumer.