Ski Challenge 2016-2017
Tak bohužel 
https://skichallenge.greentube.com/
Greentube to zapíchlo, další sezóny nebudou, pokud tedy nevyjde přechod na open-source.
Škoda.We are currently evaluating whether it is possible to make Ski Challenge available as an open-source program. We have no timeframe as of yet.