TinyWall - Lightweight and non-intrusive firewall
PuTTY - Popular free terminal application. Mostly used as an SSH client.
GlassWire - Visualize network activity in detail, get notified when new apps access the network, look out for...
MobaXterm - Enhanced terminal for Windows with X11 server, tabbed SSH client, network tools and much more
Windows Firewall Control - Windows Firewall Control is not the built in firewall system in the Windows operating systems.
iTerm2 - A terminal emulator for macOS that does amazing things.