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.
NetMonster - NetMonster is a networking app by Michal Mrocek that comes up with features to enable you to get detailed information about your current network right on your mobile phone screen.
netcat - Netcat is a featured networking utility which reads and writes data across network connections...
Mojo Packets - Wireless Troubleshooting Made Easy
Ettercap - Ettercap is a suite for man in the middle attacks on LAN.
NetMonitor Cell Signal Logging - NetMonitor Cell Signal Logging app helps you in receiving accurate measurements of the speed of the internet and the strength of signals to choose the correct network according to your needs.