Jiri Techet has their Network Analyzer Pro in Google Play Store for 99-cents (regularly $3.99) for a limited time.

Network Analyzer can help you diagnose various problems in your wifi network setup, Internet connectivity, and also detect various issues on remote servers thanks to the wide range of tools it provides.

It is equipped with a high-performance wifi device discovery tool, including all the LAN device’s addresses, manufacturers and names, together with the Bonjour/DLNA services they provide. Further, Network Analyzer contains standard net diagnostic tools such as ping, traceroute, port scanner, DNS lookup, whois, and network speed test. Finally, it shows all neighboring wi-fi networks together with additional details such as signal strength, encryption, and router manufacturer to help to discover the best channel for a wireless router. Everything works with both IPv4 and IPv6.