Usually, when you register to a site, you need to remember a username and password in order to log back in to that account you made. If you are security conscious (which, I find, is quite rare on the internet at this moment) and have a different password for each site, this eventually adds up to a really large number of passwords you need to remember. If this sounds like you, then you'll find KeePass by Dominik Reichl very useful.

KeePass is an amazing little password manager whose databases are encrypted with the strongest encryption algorithms known (at the time of posting) - AES and Twofish - and a secure password generator (depending on your settings). Since this application is open source, you can easily look through the code yourself to see if there are any backdoors or malicious code that may compromise your security.

As a cryptography and computer security expert, I have never understood the current fuss about the open source software movement. In the cryptography world, we consider open source necessary for good security; we have for decades. Public security is always more secure than proprietary security. It's true for cryptographic algorithms, security protocols, and security source code. For us, open source isn't just a business model; it's smart engineering practice.
-Bruce Schneier, Crypto-Gram 1999/09/15

License Type
KeePass is open sourced and free.

System Requirements
KeePass runs, without downloading any additional libraries, on Windows 95, Windows 98, Windows 98SE, Windows ME, Windows NT, Windows 2000, Windows XP (Home & Pro, 32-bit & 64-bit), Windows 2003 and Windows Vista.

Installation

1. Download KeePass.
2. Run the setup program you downloaded and follow the on screen instructions.

Uninstallation

1. Use Add or Remove Programs to uninstall it just like any other application.

Download: KeePass.
Info: Check out KeePass's website.