TreeSize, WinDirStat, DaisyDisk, WizTree, Baobab Disk Usage Analyzer, GrandPerspective, DiskUsage, JDiskReport, Filelight, DiskView, Spacie, Space Gremlin, Disk Usage Reports, SquirrelDisk, RidNacs, diskring, Puran Disk Files, Purple Tree, Eximo, FTPpie, FULL-DISKfighter Mac are some alternatives to DiskWave.