GNU Privacy Assistant!

Seahorse is a front end for GnuPG - the GNU Privacy Guard program - that integrates to the GNOME desktop. It is a tool for secure communications and data storage. Data encryption and digital signature creation can easily be performed through a GUI and Key Management operations can easily be carried out through an intuitive interface.

Password Safe is a password database utility.

The Password Gorilla helps you manage your logins. It stores all your user names and passwords, along with login information and other notes, in a securely encrypted file. A single "master password" is used to protect the file. This way, you only need to remember the single master password, instead of the many logins that you use.

KDE Wallet Manager is a tool to manage the passwords on your KDE system. By using the KDE wallet subsystem it not only allows you to keep your own secrets but also to access and manage the passwords of every application that integrates with the KDE wallet.