Windows: Many of you probably encrypt a lot of your more sensitive data, but you may not realise that you have more than you think. Identity Finder shows you all the vulnerable information on your drive, like credit card numbers and passwords.
Similar to Sensitive Number Finder, Identity Finder searches your Windows user folder, including files and browser data, for possible credit card numbers or passwords, and then lets you know so you can do something about it. The program also has a few options for dealing with that data, like "shredding" the file (which will make it unrecoverable), encrypting the file or quarantining it.
You'll want to make sure that the data is actually something you want to scrub before you do so, because like everything it will come up with some false positives — you don't want to accidentally delete something that just ends up being a random 16-digit number in an important script and not a credit card number. That said, though, it can be a useful tool. Even if you take precautions like encrypting your data, you may find that there's a whole lot of information on your computer that would be vulnerable if your PC were stolen.
Identity Finder is a free download for Windows only. The free version searches for credit card numbers and passwords, though there are paid versions available that will search much more, like bank account numbers and driver's licence numbers, in more areas on your drive (like email messages). There is also a paid Mac version available.