Navisens - Indoor & outdoor location without beacons, WiFi, or GPS
Glympse - Glympse is the easy way to safely share your location in realtime. No sign-up needed.
DNScapy - DNScapy is a DNS tunneling tool. The code is very light and written in Python.
Zenly - Zenly is a GPS tracker to locate your friends in realtime.
theSkimm - theSkimm app anticipates what you need to know and when.
LockOnMe - LockOnMe is a location-sharing app, displaying targets and associated Points Of Interest on maps & fun radars.