cheops-ng-static -- A Gnome network mapper, OS/port scanner, and monitoring program
http://cheops-ng.sourceforge.net/
Cheops-ng is a Network management tool for mapping and monitoring your network. It has host/network discovery functionality as well as OS detection of hosts. Cheops-ng has the ability to probe hosts to see what services they are running. On some services, cheops-ng is actually able to see what program is running for a service and the version number of that program. The future for cheops-ng includes host monitoring via various methods like ping, grabbing a web page, logging in via ftp... whatever is needed