The Rosettepedia Python SDK by Rosette Cloud Community allows developers to combine Rosette API entity-extraction results with results from the MediaWiki API in order to provide additional information about entities. This SDK is written for use with Python 3.
Dave Concannon and Charlie von Metzradt, co-founders of MetricFire, live in different parts of the world (Dave is in California and Charlie lives in Ireland), but collaborate on a mission to provide quality application metrics. The MetricFire API is one of the tools that the company offers for data transmission.
San Francisco startup Prior Knowledge recently released in public beta their predictive analytics API called Veritable. They want to enable every developer with big data prediction tools, without becoming a quant genius first. Just upload a dataset, execute analysis, make predictions and watch the sparks fly.
The non-profit built for "opening America's government" has created an app to show off its Congressional data, as well as its API (our Sunlight Labs API profile). You can't get this app on the web, though, as it's available exclusively for the Android phone platform.