Available project pages:

• country quiz
• Fourier-Scratching - A system for visualisation, sonification and interactive manipulation of lists of complex numbers. (Admittedly a very brief description.)
• joyridelabs.de - Video game company founded by Florian Hofer and Sönke Hahn, producing Nikki and the Robots.

Available user pages:

• Sönke Hahn - personal Homepage: a blog, some music, some software projects