Packet Trap

PacketTrap free network management tools are comprehensive, effective and intuitive. IT organizations around the world rely on our network management tools every day, why shouldn't you?

http://www.packettrap.com/download/

Moon Secure Av

Moon Secure AV is an open source antivirus program currently using the 'clamav' engine.  Due to fast response time and huge AV database, we are implementing another engine that is heuristic and will allow users to customize the engine on the fly. Built for Windows XP and Vista, it can scan portable and fixed drives and is able to detect viruses, Trojans and spyware.

http://moonsecure.com/