7-Zip Portable - Portable version of 7-Zip file archiver
ClamWin AV Portable - Portable version of ClamWin AntiVirus, part of the PortableApps Suite
Xplorer2 Portable lite edition - Xplorer2 is a file manager similar to windows explorer but better.
Nero Burning Rom 6 - can be made portable using launcher (script here)