Linux only: Open source app Baobab is a disc usage analyzer that
visually represents the space taken up by various files and folders on your hard
drive. Baobab is the Linux equivalent of WinDirStat
for Windows and GrandPerspective
for Mac and possesses most of the functionality of those apps. Baobab can be
used to search for and locate unusually large files, and it is not limited to
your local hard drive — it can also be used to analyze folders over FTP and
Windows shares. Baobab is a free download for Linux only and can be installed
through the repositories in most distros with the installation hook
baobab or gnome-utils.