About a decade ago I presented a hardware-based password calculator called calc.pw which generates passwords based on a single strong password and a service-dependent information, thus allowing you to use individual passwords for each of your services without having to care for a password database. I even presented it at a few conferences.
In the meantime much better microcontrollers have become available and my understanding of cryptography and password generation have improved as well. That is why I have kicked-off the reimplementation of calc.pw! 😃