The aws-sdk-cpp C++ SDK by Amazon is a service for developers that provides a C++ interface for Amazon Web Services. This SDK's main focus is on supporting game development (yet also to be helpful with other projects and systems engineering tasks) and providing platform portability.
Mashup games are always fun. Those built upon FourSquare have an extra layer of enjoyment, because they're tied to the real world. In the case of City Warfare, players use various water weaponry to soak other FourSquare users.