ncdu, TreeSize, WinDirStat, DaisyDisk, WizTree, SpaceSniffer, Baobab Disk Usage Analyzer, GrandPerspective, KDirStat, SpaceMonger, WhatSize, Disk Inventory X, SequoiaView, crossdirstat, Diskitude, Grid Size File Manager, DiskSavvy, Disko, JDiskReport, Filelight, Xinorbis, Spacie, HDGraph, FolderSizes, Disk Space Fan, Overdisk, Advanced Disk Space Monitor, xdiskusage, DiskWave, Space Radar, Directory Size Calculator, FilePro, TreePie, SquirrelDisk, K4DirStat, RidNacs, i.Disk, TDP x-Ray, DirGraph, SpaceObServer, GetFolderSize, Disk Space Visualizer, DiskMapper, PA Storage Monitor, Disk Space Fan Pro, Precious Disk, ClearDisk, Disk Space Pro, Better Directory Analyser, DiskTriage, StepTree, Disk Space Finder, UtilStudio Disk Space Finder, Diskvision are some alternatives to DiskUsage.