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.
TinyWall - Lightweight and non-intrusive firewall
SmartSniff - SmartSniff is a packet sniffer that capture TCP/IP packets and display them as sequence of conversations between clients and servers.
simplewall - Simple tool to configure Windows Filtering Platform (WFP) which can configure network activity on...
Ettercap - Ettercap is a suite for man in the middle attacks on LAN.
GlassWire - Visualize network activity in detail, get notified when new apps access the network, look out for...