Zabbix - Track, record, alert and visualize performance and availability of IT resources
Zenoss Core - Zenoss (Zenoss Core) is an open source application, server and network management platform based on...
Statista - The Statistics Portal for Market Data, Market Research and Market Studies
LANState - LANState - Network Mapper and Device Monitor
Montecarlito - MonteCarlito is a free Excel-add-in to do Monte-Carlo-simulations.
Nagios - Complete monitoring and alerting for servers, switches, applications, and services