Password Management Applications?

KeePassX

KeePassX is a free/open-source password manager or safe 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-disk. So you only have to remember one single master password or insert the key-disk to unlock the whole database. The databases are encrypted using the algorithms AES or Twofish.

I suggest you the free, cross-platform KeePassX. I'm using it on my Android phone too(KeePassDroid, combined with Dropbox). You can install from the software center

KeePassX

KeePassX is a free/open-source password manager or safe 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-disk. So you only have to remember one single master password or insert the key-disk to unlock the whole database. The databases are encrypted using the algorithms AES or Twofish.

You can find the features here, and more screenshots here.

Seahorse is an application that is installed in Ubuntu by default and manages passwords for various applications.