FreeNAC - LAN access control tool providing VLAN assignment and management, access control, live network inventory and documentation of patch cabling. - http://www.freenac.net
NetworkTools - A Java based toolkit made up of a protocol analyzer and a port scanner to monitor and troubleshoot security and network problems. - http://networktools.sourceforge.net
The Freefire Project - Provides information about open source security software. - http://sites.inka.de/lina/freefire-l/index.en.html