Zenly - Zenly is a GPS tracker to locate your friends in realtime.
Mapstr - Your places, your world!
ToT: ThisOrThat - Let your friends choose this or that for you
Location History Visualizer - Visualize Google location history data on a heatmap 🗺️
sup - The first creep-free way to see nearby friends
Mapiful - Create & order custom printed maps of your favorite places