Mapple.me - Mapple.me bridges the gap between available time and availability of friends to increase social...
Glympse - Glympse is the easy way to safely share your location in realtime. No sign-up needed.
Pathshare - Pathshare is a beautiful app that helps you share your path in realtime.
Miataru - be found
OwnTracks - Cross-platform location sharing
Foursquare - Foursquare is all about helping you find new ways to explore your city.