The Benchmark Email Ruby SDK by Benchmark is available for download on the page provided. It allows API communication to integrate email, campaigns, events, and marketing features into web services and mobile applications. With the SDK, developers are able to work with methods that support easiness and maintenance of projects.
If you have a popular application built upon Yahoo APIs, chances are the company is interested in funding your project. According to Computer World, Yahoo has recently funded or acquired developer applications that began as products of the successful Hack Days.