Foursquare-hackathon-09-2012 is a project mainly written in SCALA and JAVASCRIPT, it's free.
A little scala app I'm building on the foursquare API for the global hackathon
For fun I wanted to implement a view of my foursquare check-ins that looks like the "fog of war" map view from the old game Strategic Conquest. Uses the Scala foursquare library at https://github.com/nfolkert/scala-foursquare-api