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.
PuTTY - Popular free terminal application. Mostly used as an SSH client.
netcat - Netcat is a featured networking utility which reads and writes data across network connections...
MobaXterm - Enhanced terminal for Windows with X11 server, tabbed SSH client, network tools and much more
Ettercap - Ettercap is a suite for man in the middle attacks on LAN.
iTerm2 - A terminal emulator for macOS that does amazing things.