Folder Size Tree displays all drives/folders/files size in a tree view, in order to let you to manually clean disk space conveniently. You can do some common operations for the checked items in batch mode, such as Delete, Copy and Move. Also, it has a few special operations (e.g. Get Item Full Path) for the selected resource. Actually, it is a UNIX-like "du" command, you can think it as a Windows GUI "du" program.