The SharpSquare .NET is a third party SDK that offers a simplified access to the FourSquare API. It is supported by the oAuth protocol. Resources include code example, authentication, and create a check-in usage examples. For additional info, contact authors @MicheleBertoli and @ufranchini
DropBuddies, the Postmates of Nigeria, launched an API that allows local businesses to include courier services directly within their apps. Without leaving the integrated business' app, users get a delivery quote, ETA, and book a delivery. Once booked, users can track shipments through delivery.
Last month Yahoo! announced BOSS, its Build Your Own Search Service, which "allows developers and companies to create and launch web-scale search products by utilizing the same infrastructure and technology that powers Yahoo! Search." The REST API allows developers to get results in XML or JSON format for web, news, and image search queries. Recently the official Yahoo! Search Blog showcased a handful of the best mashups that third-party developers created in BOSS's first month of operation.