ncdu, TreeSize, WinDirStat, DaisyDisk, WizTree, SpaceSniffer, Baobab Disk Usage Analyzer, GrandPerspective, KDirStat, SpaceMonger, WhatSize, OmniDiskSweeper, Disk Inventory X, SequoiaView, DiskUsage, crossdirstat, Diskitude, Grid Size File Manager, DiskSavvy, Filelight, Xinorbis, DiskView, HDGraph, FolderSizes, Overdisk, xdiskusage, DiskWave, Space Radar, Disk Usage Reports, Directory Size Calculator, TreePie, SquirrelDisk, K4DirStat, RidNacs, i.Disk, TDP x-Ray, 1Tree Pro, DirGraph, SpaceObServer, GetFolderSize, DiskMapper, PA Storage Monitor, ClearDisk, xdu, DiskTriage, StepTree, Disk Space Finder, UtilStudio Disk Space Finder, Diskvision are some alternatives to JDiskReport.