Facebook Places - Let your friends help you discover restaurants, hotels, museums and more.
TransforMap - There are Plenty of Alternatives. TransforMap makes them visible.
Glympse - Glympse is the easy way to safely share your location in realtime. No sign-up needed.
Roomino - Simple travel booking for Slack teams
Zenly - Zenly is a GPS tracker to locate your friends in realtime.
Umapio - Umapio is a map showing your friends and strangers. Make friends all over the world!