Glympse - Glympse is the easy way to safely share your location in realtime. No sign-up needed.
a.placebetween.us - Find a meeting point based on place type
Zenly - Zenly is a GPS tracker to locate your friends in realtime.
BubbleGlobe - Book unique things to do with locals
OwnTracks - Cross-platform location sharing
Everfest - A global calendar and search engine for festivals