Open source Network scanners for Windows

Angry IP Scanner

Angry IP Scanner is an open-source and cross-platform network scanner designed to be fast and simple to use. It scans IP addresses and ports as well as has many other features. (GPL)

Linux - Windows - macOS

Nmap

Nmap ("Network Mapper") is a free and open source utility for network exploration or security auditing. (GPL)

Cross-platform

SNORT

SNORT is an open source network intrusion prevention and detection system. (GPL) (GPL)

Cross-platform

Wireshark

Wireshark is the world's foremost network protocol analyzer, and is the de facto (and often de jure) standard across many industries and educational institutions. (GPL)

Linux - FreeBSD - Windows - macOS

4 applications