TreemapScan

TreemapScan helps you find out why your Mac’s disk is filling up by showing you which files and folders take the most space. It scans a drive or folder you choose and draws the result as a treemap, where every file and folder is a rectangle sized in proportion to the space it uses, so the biggest items stand out immediately. You can use the map alone or combine it with column and list views. A selection in one view carries over to the others, and hovering over any item shows its details on the spot. Search, custom locations, performance options, over 20 color themes and various display options let you adapt it to your own taste. Once you've found out what's taking up space, you can open or show the file in Finder or move it to the Trash straight from the app.