The "Hommingberger Gepardenforelle" is free! At least, it is freely invented ;-)

The goal is to get a high search machine ranking for the word Hommingberger Gepardenforelle... Curious? Search the web with your favorite search engine to know more ;-)

GNU Solfege is a computer program written to help you practice ear training. It can be useful when practicing simple musical exercises.

Tux Paint" is a drawing program for young children. It provides a simple interface and fixed canvas size, and will provide access to previous images using a thumbnail browser (e.g., no access to the underlying filesystem).

TuxTyping is an educational typing tutor for children starring Tux, the Linux Penguin.