The screenshots of GWEN look nice, but... Is there no documentation at all? I haven't found one on the Google Code page, and the sources don't seem to contain doxygen comments. And it doesn't use SFML 2. GWEN looks nice in the first term, however a missing documentation makes a library close to useless (or at least a bad choice compared to other similar frameworks)... :?
But it's work in progress, so there is hope. I wonder if the developers plan to write the documentation only in the end, after the code is complete...