Mnemosyne

Mnemosyne is a password generator. It doesn't generate random passwords. Instead, passwords are generated based on a key and an user name. If you remember the key you can recreate any password for any user name you have created somewhere along the way. Mnemosyne is also available for the iPhone

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This app is an enhanced clone of the old pre-OS X freeware "Guarddogg" from 1996 (written by David Gan and Evan Olcott) but it uses another encryption algorithm. Therefore you can not recreate old Guarddogg passwords with this application.