One of the coolest sites I have seen recently!
GJ Open is a crowd-forecasting site where you can hone your forecasting skills, learn about the world, and engage with other forecasters. On GJ Open, you can make forecasts about the likelihood of future events and learn how accurate you were and how your accuracy compares with the crowd.
Follow
@mikeharmanos This is basically Predictit, but without the bucks and giggles!