Get Shit Done - Free Bootstrap 3 UI kit
Glympse - Glympse is the easy way to safely share your location in realtime. No sign-up needed.
NOW UI kit by InVision - A beautiful cross-platform UI kit (PSD & Sketch)
Zenly - Zenly is a GPS tracker to locate your friends in realtime.
Spaces by proto.io - A community to showcase your interactive prototypes
OwnTracks - Cross-platform location sharing