greenfee.com GmbH greenfee.com GmbH is the booking portal for teetimes. The online platform makes it possible for golf players to book their teetimes worldwide on the internet. Golf clubs can optimise their utilised capacity with teeontime - without having to install additional software. As a partner company of the successful Wilken GmbH teeontime benefits from the know – how of experienced software developers. Wilken group of companies For 30 Years Wilken has offered Software solutions and shows excellent references in the areas of tourism (amongst others Switzerland Tourism, Rügen, Lufthansa Airplus), and it has also provided the software for the Swiss financial department.