disk

Baobab is a C/gtk+ application to analyse disk usage in any Gnome environment. Baobab can easily scan either the whole filesystem tree, or a specific user-requested directory branch either on the local system or on a remote system.

TrueCrypt is a free opensource software system for establishing and maintaining an on-the-fly-encrypted volume (data storage device). On-the-fly encryption means that data are automatically encrypted or decrypted right before they are loaded or saved, without any user intervention. No data stored on an encrypted volume can be read (decrypted) without using the correct password/keyfile(s) or correct encryption keys. Entire file system is encrypted (e.g., file names, folder names, contents of every file, free space, meta data, etc).