OpenStreetPad is an OpenStreetMap renderer based on MapCSS styles. In it's current state it is integrated into an application that shows a single OSPMapView. There are currently several bugs and shortcomings in OpenStreetPad, but they should be fixed pretty rapidly.
To use OpenStreetPad, you must clone CoreParse into the same directory you clone OpenStreetPad into:
git clone git://github.com/beelsebob/CoreParse.git
git clone git://github.com/beelsebob/OpenStreetPad.git
Once you've done this, open the OpenStreetPad and build the OpenStreetPad target. You should not need to build any other target.