A collection of links I recommend.
- Swiss Olympiad in Informatics
- Helvetic Coding Contest
- SPOJ: solve algorithmic problems and submit them to the online grader
- PONS online dictionary
- LEO online dictionary
- map.geo.admin.ch, the free online version of the very nice maps by the Swiss Federal Office of Topography swisstopo
- Project Gutenberg, and its German version by Spiegel
- duolingo: "learn a language for free, and simultaneously translate the web"
- Stop Software Patents