WinDirStat

WinDirStat is a free and open-source graphical disk usage analyzer for Microsoft Windows. It presents a sub-tree view with disk-use percentage alongside a usage-sorted list of file extensions that is interactively integrated with a colorful, cushion shaded display of a treemap. Created as an open-source project released under the GNU GPL, it was developed using Visual C++/MFC and distributed using GitHub, which recently converted to custom Win32/GDI based UI framework. The project was inspired by SequoiaView, an application based on research done by the Visualization Section of the Faculty of Mathematics and Computer Science at the Technische Universiteit Eindhoven. WinDirStat was downloaded more than 9 million times from the official source since its original release in October 2003 through 2011. As of August 2024, it was the third most downloaded "Filesystems" software on SourceForge, with more than 54,000 downloads per week. As of early 2024, the project has been very active and released its first new version after many years. Source code is provided for all released versions on the GitHub page in ZIP format. WinDirStat is developed via Git revision control. FossHub (official download mirror of WinDirStat) reported 6,912,000 downloads in January 2019, being the most downloaded software from "Disk Analysers" category."