Streamzoo, an alternative to Instagram, has just released the Streamzoo API. According to the documentation, the API uses HTTP calls and returns JSON. It joins 341 photo APIs in the ProgrammableWeb directory.
Bryan Parker founded ImageFly out of necessity: "To be honest, I was fed up with having to bounce around between image libraries when I was hammering out a project. It seems like it was GD one day, RMagick the next, and something else the next." ImageFly exists to simplify image modification. The ImageFly API grants developers many image editing tools within web properties and applications.
For most of ProgrammableWeb's nearly six years, there were two things that always remained true about the mashup directory. First, that Google Maps is the most popular API used to create mashups. And second, that Flickr is a distant second, but well ahead of third. Recently one of these is no longer true, as the Twitter API has passed Flickr in popularity.