CloudSight - Image recognition API; send an HTTP request with an image, get a description of contents.
Detour - Immersive audio walks, now in 17 cities
Dashmote - Dashmote bundles stock image providers to make finding stock images as easy as possible.
Photo Find - Navigate to the exact spot a photo was taken
YOLO - Real-time object detection
NoFilter - Discover great photo locations all over the world.