The Wolfram Alpha Ruby Library by Ian White is available for download to start working with the API. Some of the API resources that Wolfram Alpha offers include AppID, sample query, visual representations, and mathematical representations. Such material aims to assist in the integration of API features that include reference, search, and semantics.
Our API directory now includes 46 research APIs. The newest is the Globus Online Transfer API. The most popular, in terms of mashups, is the Mendeley API. We list 3 Mendeley mashups. Below you'll find some more stats from the directory, including the entire list of research APIs.