duc
Duc is a collection of tools for indexing, inspecting and visualizing disk usage. Duc maintains a database of accumulated sizes of directories of the file system, allowing queries this database, or create fancy graphs to show where data is.
TLDR
Index the /usr directory, writing to the default database location ~/.duc.db
$ duc index [/usr]
List all files and directories under /usr/local, showing relative file sizes in a [g]raph
$ duc ls -Fg [/usr/local]
List all files and directories under /usr/local using treeview recursively
$ duc ls -Fg -R [/usr/local]
Start the graphical interface to explore the file system using sunburst graphs
$ duc gui [/usr]
Run the ncurses console interface to explore the file system
$ duc ui [/usr]
Dump database info
$ duc info