Glympse - Glympse is the easy way to safely share your location in realtime. No sign-up needed.
Six Degrees of Wikipedia - Find the shortest path between two subjects
Zenly - Zenly is a GPS tracker to locate your friends in realtime.
Pathica - Find a path to connect with anyone on Instagram.
OwnTracks - Cross-platform location sharing
IconWorkshop - Application to create and manage software icons. A must for developers.