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.
Cell Signal Monitor - Cell Signal Monitor is an advanced network monitor that helps you to watch the state of cellular network by gathering data about cell towers. The app supports GSM, UMTS and LTE networks. There is a Free edition with adds.
Network Analyzer - Network Analyzer app lets users discover new high-speed WiFi networks to connect to them and download files of big sizes in a matter of seconds.
tPacketCapture - tPacketCapture is packet capture app. It captures packets without using any root permissions. It uses VpnService provided by Android OS.
Mojo Packets - Wireless Troubleshooting Made Easy
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.