Friendz - Friendz is a free GPS based app that lets you find your groups on the map & keeps you notified.
Glympse - Glympse is the easy way to safely share your location in realtime. No sign-up needed.
Facebook Places - Let your friends help you discover restaurants, hotels, museums and more.
Zood Location - Share your location with each other, so you can make sure everyone is safe with a quick glance at your phone.
TransforMap - There are Plenty of Alternatives. TransforMap makes them visible.
Wherezat - Wherezat is Fast, free, and easy way to share your location with your friend or family.