TrafficMonitor - TrafficMonitor is a network monitoring suspension window software in Windows.
NetBox - NetBox is an open source web application designed to help manage and document computer networks. NetBox was developed specifically to address the needs of network and infrastructure engineers.
NetBalancer - NetBalancer is a Windows application for local network traffic control and monitoring.
Snipe-IT - Managing assets with a Google doc or a shared Excel spreadsheet is more common than you think.
NetTraffic - Essential network bandwidth monitor.
Zabbix - Track, record, alert and visualize performance and availability of IT resources