Glympse - Glympse is the easy way to safely share your location in realtime. No sign-up needed.
WeatherTunes - Weather based radio and music discovery
Zenly - Zenly is a GPS tracker to locate your friends in realtime.
EventsApp - A simple concise app for creating and sharing events.
OwnTracks - Cross-platform location sharing
Sparq Events - 3D Social Networking