Duc is an open source utility for indexing, analyzing, and visualizing the disk usage of files and directories on a computer system. It is designed to help users quickly identify the largest files and directories occupying disk space on their system, and to provide an overview of how disk space is being used over time. It can be used to analyze storage usage for individual hard drives or entire storage systems, including networked storage devices. Duc can generate interactive charts and diagrams that provide an at-a-glance view of disk usage and trends, allowing users to quickly identify areas to optimize their disk space. It is available as a command line utility, as a web-based interface, and as a free mobile app.
Discontinued The program seems to be no longer updated. The latest version, 2.13, released in July 2012, is fully functional and can still be downloaded from the official website.