Glympse - Glympse is the easy way to safely share your location in realtime. No sign-up needed.
FareUpThere - Earn rewards for your feedback on flights
Zenly - Zenly is a GPS tracker to locate your friends in realtime.
LockOnMe - LockOnMe is a location-sharing app, displaying targets and associated Points Of Interest on maps & fun radars.
Skyscanner - Skyscanner.com compares over 1000 airlines to find you the cheapest airfares, fast.
OwnTracks - Cross-platform location sharing