MobaXterm - Enhanced terminal for Windows with X11 server, tabbed SSH client, network tools and much more
Nmap - Nmap Free Security Scanner, Port Scanner, & Network Exploration Tool. Download open source software for Linux, Windows, UNIX, FreeBSD, etc.
ConEmu - ConEmu-Maximus5 is a full-featured local terminal for Windows devs, admins and users. Get better console window with tabs, splits, Quake style, copy+paste, DosBox and PuTTY integration, and much more.
Angry IP Scanner - Open-source and cross-platform network scanner designed to be fast and simple to use
Cygwin - Cygwin is a set of tools that provide Linux and POSIX functionality to Windows.
Fing - Discover which devices are connected to any Wi-Fi network, map devices, detect intruders, assess...