The Dude - MikroTik is a Latvian company which was founded in 1996 to develop routers and wireless ISP systems. MikroTik now provides hardware and software for Internet connectivity in most of the countries around the world.
Zenoss Core - Zenoss (Zenoss Core) is an open source application, server and network management platform based on...
Pandora FMS - Pandora FMS: Opensource monitoring software
LANState - LANState - Network Mapper and Device Monitor
cStatus - Monitor and scan a network.
Nagios - Complete monitoring and alerting for servers, switches, applications, and services