The RunKeeper Health Graph Android SDK by Levelcap permits API communication to integrate running features into applications. See content related to OAuth initialization methods, updated fitness activity, and a sample web application with TomCat as a plugin.
With the holiday weekend coming up in the U.S., avid divers may be making their way to their favorite spots. Dive.io is a web service designed for divers, so they can log their dives, share their favorite dive spots, and meet fellow divers. It's very specific, but it does its task quite well. It also has a nice API, allowing for integration of the service into, well, anything at all.