wisaw - What I Saw Today (cool things) -- Minimalistic Anonymous Photo Sharing
Glympse - Glympse is the easy way to safely share your location in realtime. No sign-up needed.
Augin - Augin is an augmented reality platform to create, publish and view augmented reality apps.
Zenly - Zenly is a GPS tracker to locate your friends in realtime.
WallaMe - Hide messages in the real world using augmented reality
OwnTracks - Cross-platform location sharing