Why on earth is this being downvoted? If you've used a hashing generator for any length of time you'll know how multiple master passwords inevitably creep in. Also, when your generator no longer works because the login FQDN changes (which happens alarmingly often) you'll have all the fun of resetting your password. For no good reason.
Re. portability, KeePass and its siblings are compatible with every major platform.
Re. portability, KeePass and its siblings are compatible with every major platform.