NMapSi4 v0.2.86 Alpha2
“NmapSi4 is a complete Qt-based Gui with the design goals to provide a complete nmap interface for users, in order to management all options of this powerful security net scanner!“

Download
http://code.google.com/p/nmapsi4/downloads/list

Nmap Free Security Scanner For Network Exploration & Hacking
http://nmap.org/