Building this website, we didn't start from scratch and attribute here, where things come from:
This website is based on the website of the travis foundation, which is licenced under MIT.
Image on main page
Original creator: A. Josef Dernbecher licensed under CC BY-SA 3.0. Modifications: Well, it's more greyish now. And smaller.
Image on page for program, registriation etc.
Copyright by Universität des Saarlandes, creator: Luftbildcentrum.