MobaXterm - Enhanced terminal for Windows with X11 server, tabbed SSH client, network tools and much more
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.
KiTTY - KiTTY is a fork from version 0.70 of PuTTY. It adds extra features to PuTTY.
Winsock Packet Editor - WPE Pro is a packet editor.
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.
Nipper - Nipper - Neat Internet Protocol Packet EditoR - is a graphical packet generation tool.