Win10Pcap - Win10Pcap is a WinPcap-based Ethernet packet capture library.
Nmap - Nmap Free Security Scanner, Port Scanner, & Network Exploration Tool. Download open source software for Linux, Windows, UNIX, FreeBSD, etc.
Npcap - Npcap is the Nmap Project's packet sniffing library for Windows.
Angry IP Scanner - Open-source and cross-platform network scanner designed to be fast and simple to use
Wireshark - Wireshark is a network protocol analyzer for Unix and Windows. It lets you capture and interactively browse the traffic running on a computer network.
Advanced IP Scanner - Advanced IP Scanner shows all network devices, gives you access to shared folders, and can even remotely switch computers off. Download it Free.