Magical Jelly Bean
The Magical Jelly Bean Keyfinder is a freeware utility that retrieves your Product Key (cd key) used to install windows from your registry
Recover product keys for Windows, Office, Adobe products, Acronis products, Electoric Arts games, WinZip, Nero and more than 6500+ other programs
PasswdFinder is a neat freeware utility that helps you find your lost passwords. Once installed, it will show you passwords saved by web-browsers, instant messengers and other programs.
Find your lost Wi-Fi passwords. Don't remember with which password you connected to your wireless network? This small tool will simply enumerate saved Wi-Fi passwords.
Mac KeyFinder is product key finder for Mac OSX.