Link2SD
Link2SD is targeted towards rooted Android smartphones running version 1.6 to 2.1 of the operating system. This app allows you to install aps on the memory card rather than internal memory, an ability that was introduced in later versions of Android. Aside from rooting, a second partition must also be created on the memory card.
What we like: Freeing up internal memory, which can sometimes improve performance.
AndroSensor
AndroSensor provides a unified view of what your device’s various sensors are detecting. Supported sensors include: location, accelerometer, gyroscope, light, magnetic field, proximity, temperature, battery, orientation, and sound.
What we like: The option to see the results in graphs.
Network Discovery
Network Discovery scans Wi-Fi networks to find computers and other equipment. This app also doubles as a port scanner.
What we like: The rapid scan speed.
Fing - Network Tools
Fing – Network Tools is the Swiss Army Knife of networking utilities for Android. This app includes a port scanner, network scanner, ping, traceroute, DNS lookup, Wake on LAN, and connectivity testing. Fing – Network Tools works on Wi-Fi, 3G, and 4G networks.
What we like: An editable list of tested ports.
G-MoN
G-MoN is a wardriving app capable of collecting and locating all detected Wi-Fi access points. G-MoN scans nearby Wi-Fi signals and saves their locations in a file on the memory card. It can also display information about the mobile data connection (2G, 3G, and 4G).
What we like: The ability to catalog and rate Wi-Fi access points.
Wifi Analyzer
Wifi Analyzer turns your Android smartphone into a... well, a Wi-Fi analyzer. This app is capable of finding Wi-Fi hotspots close to you, while also giving you the signal strength and the channel used, all in a convenient graph. A signal meter is available, too.
What we like: The ability to find the most-ideal, least-jammed channel for your wireless network.
WiFi Manager
WiFi Manager not only lets you find wireless hotspots, but also allows you to manage and connect to them. This app displays the channel, signal strength, and type of password protection associated with the signals it finds.
What we like: The lightning-fast hotspot detection and ability to attach labels to detected networks.
OpenSignal
Thanks to OpenSignal, you’ll know which way to walk when you’re losing signal strength. This app generates a map of mobile network antennas. It's able to determine the direction of the antenna you are connected to and the strength of the signal it emits. A compass points you towards the closest tower with the best signal. A Wi-Fi map also catalogs the location of open Wi-Fi hotspots.
What we like: The possibility of avoiding “dead zones”.
GPS Test
GPS Test is a robust utility that displays position, speed, altitude, universal and local time, sunrise and sunset times, and even the position of satellites. Thanks to GPS Test, you will now find a use for the GPS sensor in your smartphone.
What we like: Multiple color schemes and a non-cramped UI that is extremely easy-to-read.
GPS Essential
GPS Essential brings together everything your phone’s GPS sensor and compass are capable of measuring: minimum and maximum speeds, actual speed, position, altitude, lunar phase, time, bearing, and climb. The map function of this app supports Google Maps, MapQuest, and OpenStreetMap. You can even take pictures that have a HUD watermark and embedded GPS information.
What we like: The ability to create waypoints and save routes.
