Google Cloud Vision API gives developers access to powerful image processing and analysis tools for use in any project. This tutorial on Google Cloud Platform shows followers how to use the API to detect faces in an image, and use the returned coordinates to draw a polygon around each face.
NASA has released a new API (the EPIC API) which provides programmatic access to images pulled from the EPIC camera. EPIC sits upon the DSCOVR satellite and constantly provides images from the Earth's sunlit side. Developers can retrieve images from the camera along with associated metadata.
The prevalence of mashups on the web is probably thanks to the Google Maps API and other mapping APIs. It remains the most popular type of mashup, more than three times the second-most, photos. The ubiquity means maybe map mashups have lost some of their luster.