Released and supported by Instagram, this library allows Ruby applications to interface with the Instagram REST and search APIs. One can follow updates to this library on the Instagram Developer's Blog or the Stack Overflow community hub.
Discussion of Google's recent acquisition of Jambool has largely centered around its virtual currency platform, Social Gold. The power behind that platform comes in the form of the Social Gold API. Again, Google has bought a company whose API is central to its success.
OpenJaw Technologies, a leading online technology partner for the world's biggest travel brands, has launched the OpenJaw Tribe Developer Community which provides developers access to the OpenJaw t-Retail Platform as well as to a variety of tools and resources that help simplify the integration of the platform into third-party applications.
According to a post from a Google engineer, intended to be private to the search giant's employees, the Google+ API was not ready at launch. Google's Steve Yegge also badmouthed the read-only, public API. When the company's new service was only two weeks old, I wondered whether the Google+ API was intentionally late. Maybe it was just truly late.