NMAP has a GUI front-end (nmapFE). Visit www.insecure.org and you can grab the tarball or the RPM.

Agreed. Nessus is a beast. Seeing that you can write your own NASLs, it is exceptional. There are two GUI interfaces for Nessus too. One for *nix and one called NessusWX which runs on windows while your scan engine runs on *nix.

Good luck.


--Th13