recALL is described as 'Is free and portable multifunctional password recovery and auditing solution for Windows - instantly finds and recovers passwords from more than 200 popular applications (FTP, E-mail clients, Instant Messengers, Browsers) and recovering licenses from over 2800 programs' and is an app in the security & privacy category. There are seven alternatives to recALL for Windows and Linux. The best recALL alternative is ProduKey, which is free. Other great apps like recALL are Magical Jelly Bean Keyfinder, Recover Keys, LicenseCrawler and Enchanted Keyfinder.
It's a very efficient key finder. I've found that it finds at least a quarter of the keys I have on my system. Although that doesn't sound all that great, it's much better than other products I've tried.