Free UPX version 1.1 (01.07.2008), good freeware gui for the UPX Packer
Features *Easy acces to all UPX command-line parameters. *Displaying detailed informations about compressed files: original file size, compresson ratio, UPX version, compression level and other. *Predefined UPX profiles for beginners. Advanced users can define custom profiles. *Shell integration (optional).