The JotForm Go Sample Code by JotForm presents API interaction, demonstrating how to obtain the latest 100 user submissions by creation date. In the same page, developers can find documentation and authentication as part of the SDK client.
Wolfram Alpha, the up-and-coming "answer engine" that we reported on back in May, has just released an API that developers have been awaiting since this spring. The new RESTful API provides access to the vast stores of data and computational knowledge available through the Wolfram Alpha project (technical details at our Wolfram Alpha API profile).
Our API directory now includes 39 answers APIs. The newest is the SlimSurveys API. The most popular, in terms of mashups, is the Yahoo Answers API. We list 28 Yahoo Answers mashups. Below you'll find some more stats from the directory, including the entire list of answers APIs.