Software that allows you to locate and remove duplicate files.

Free disk formatting software.
Keep your sensitive data secure with this file encryption software.
Free and portable software aimed at the creation, editing, and manipulation of ISO/CSO files used in PlayStation Portable (PSP) games and applications.
Portable version of the popular disk analysis software WinDirStat for Windows.
Portable version of Recuva, software that allows you to recover deleted files.