The Handshake Java SDK by Justin communicates with the API to grant access via Minecraft accounts. To start the server, developers can visit https://github.com/ItsAGeekThing/Handshake/blob/master/src/io/github/itsageekthing/handshake/handshake.java
The U.S. Federal Government has been making a push to increase accessibility to data managed and maintained by various government agencies and departments. Recently Business.gov, the government's official web site for small businesses (sponsored by the U.S. Small Business Administration), has released an API that provides access to various types of data that will can benefit small businesses.
The Resfly API gives developers access to a integrating the ability to post jobs on many of the big job boards onto their platform. These range from Indeed (which apparently has eclipsed Monster) to Linkedin, from Craigslist to specialized ones in health care and other interests.