Linux Tools

Linux Tools Bootable Linux Tools PartedMagic http://partedmagic.com/   KdirStat – apt-get install kdirstat (http://kdirstat.sourceforge.net/)

Mac Tools

Mac Tools View Folder Sizes – MacOS X it would be Disk Inventory X or GrandPerspective AppleJack http://applejack.sourceforge.net/  

Windows Tools

CCleaner – Useful for quick cleanup of machine http://www.piriform.com/ccleaner EasyCleaner by ToniArts http://personal.inet.fi/business/toniarts/ecleane.htm MyDefrag   Windows Easy Transfer Latest Versions for Migration: http://windows.microsoft.com/is-IS/windows7/products/features/windows-easy-transfer MigRecover – Useful if you forgot or damaged your Windows Easy Transfer File http://www.visser.com.au/blog/migrecover-for-microsofts-windows-easy-transfer/ Windows Product Key Update Tool http://windows.microsoft.com/en-US/windows/help/genuine/product-key NTBackup Windows XP Backup: http://support.microsoft.com/kb/308422 WinDirStat Shows folder usage – http://windirstat.info/