QNmap is just another X nmap frontend. The main difference, as far as I know, is that it can be run as a non-root user with some functionality It will eventually incorporate all of nmap's documented features and will be updated to reflect newer versions.
QNmap is a property of QNmap respective authors, vendors and developers. You can download QNmap for your hardware. If you want to use QNmap for other purpose, Please contact the authors, vendors and developers of QNmap.