Cisco Network Assistant - Cisco Network Assistant simplifies wired and wireless network management, and provides critical product information using Cisco Active Advisor.
Technitium MAC Address Changer - Technitium MAC Address Changer (TMAC) is a freeware utility to instantly change or spoof MAC Address of any network card (NIC).
Npcap - Npcap is the Nmap Project's packet sniffing library for Windows.
Axence netTools - Axence netTools is completely free of charge, both for home and commercial use – all you have to do is to register. A tool for professionals – and others.
WinPcap - Industry-standard tool for link-layer network access in Windows.
Zabbix - Track, record, alert and visualize performance and availability of IT resources