What is KeePass?
Today you need to remember many passwords. You need a password for the Windows network logon, your e-mail account, your homepage's FTP password, online passwords (like website member account), etc. etc. etc. The list is endless. Also, you should use different passwords for each account. Because if you use only one password everywhere and someone gets this password you have a problem... A serious problem. The thief would have access to your e-mail account, homepage, etc. Unimaginable.
KeePass is a free open source password manager, which helps you to manage your passwords in a secure way. You can put all your passwords in one database, which is locked with one master key or a key file. So you only have to remember one single master password or select the key file to unlock the whole database. The databases are encrypted using the best and most secure encryption algorithms currently known (AES and Twofish). For more information, see the features page.
Is it really free?
Yes, KeePass is really free, and more than that: it is open source (OSI certified). You can have a look at its full source and check whether the encryption algorithms are implemented correctly.
Download here (for Portable device):
2.
Stable Release Portable KeePass 2.09 (ZIP Package)
Download this ZIP package and unpack it to your favorite location (USB stick, ...). KeePass runs without any additional installation and won't store any settings outside the application directory.
Supported operating systems:
Windows 98 / 98SE / ME / 2000 / XP / 2003 / Vista / 7, each 32-bit and 64-bit, Mono (Linux, Mac OS X, BSD, ...).
Prerequisites:
Microsoft .NET Framework = 2.0 or Mono = 2.2.
source: http://keepass.info/