Minecraft. I use it as a club to foster team building, creativity, energy, communication skills, leadership skills and organisational skills as well as the tecnical Computer Science skills of decomposition and algorithm building.
Its a flexible club that currently runs every lunchtime, and on a semi regular basis I take a screencastify and give a tour.
The latest video build is below
and the link to the channel itself is here, where you will find a history of videos that have been recorded in the classroom.