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Ideally there would be a way to emphasize only the types of files we're interested in, but common treemap visualizers have very limited filtering capabilities. The primary use case of this class of utility is to quickly identify large files to help with filesystem maintenance. The example here is taken from WizTree on Windows but there are a number of free and commercial tools available for each platform. SequoiaView, KDirStat/QDirStat, WinDirStat, and Disk Inventory X all provide roughly the same functionality.
Conveniently, treemap generation is not terribly complex; the original papers describing the algorithms for squarifying and cushioning treemaps are readily available. Further, treemaps have been used to visualize a wide variety of hierarchical data beyond filesystem contents. There are libraries in a number of languages which simplify treemap creation, for example the Python library squarify generates treemap images using the Matplotlib plotting library.
A larger legacy FORTRAN project is NASTRAN-95, a finite element structural analysis code (again from NASA) that consists of almost 2000 individual source files as well as substantial example case input and output files.