CloudSight - Image recognition API; send an HTTP request with an image, get a description of contents.
Bieber Bomb - Text bomb your friends random Justin Bieber lyrics
Dashmote - Dashmote bundles stock image providers to make finding stock images as easy as possible.
Drake Shake - Shake to add Drake to any photo
WTF is that? - Send any picture and it will tell you what it is!
Trump Troll - Troll your friends with Trump quotes