Linux Tools

Linux Tools Bootable Linux Tools PartedMagic   KdirStat – apt-get install kdirstat (

Mac Tools

Mac Tools View Folder Sizes – MacOS X it would be Disk Inventory X or GrandPerspective AppleJack  

Windows Tools

CCleaner – Useful for quick cleanup of machine EasyCleaner by ToniArts MyDefrag   Windows Easy Transfer Latest Versions for Migration: MigRecover – Useful if you forgot or damaged your Windows Easy Transfer File Windows Product Key Update Tool NTBackup Windows XP Backup: WinDirStat Shows folder usage –