It's called pencil and paper. I have a notebook, and all pwds are encoded there. I have 4 simple rules for modifying what I write into what I type in. An example rule you could use is "Real pwds use only even digits; Passwords are written with all ten digits, odd digits are ignored". 2-4 simple rules will make it unhackable even for someone with physical control of passbook. (Never write down the rules - keep them in yer head).
To keep the rules fresh, use different passwords and uids for every single app or website possible. You'll always be rehearsing the rules in yer head, you won't forget them.
Here's an example from my current set: pwd= "RhinoPott=amus" Rule 1,3
I'll bet you can't guess the real password in 10,000 tries. You don't know rules 1 or 3, which modify what's written. Go ahead, give me 10000 tries in a text file - I'll let you know if you get it.
This really really works - I've been doing this way since the 1980's, and haven't misplaced a properly coded pwd yet.