198 Google Summer of Code 2006 is a program that offers student developers stipends to create new open source programs or to help currently established projects. Google is working with a variety of open source, free software, and technology-related groups. This year it is the first time when there are also project focused on the Geoinformatics. The organization that offers such projects is called Refraction Research. The aim of this paper is to describe Summer of Code itself and also the projects that have been in progress this year (with respect to (geoinformatics). More attention will also be given to the author’s project “Coordinate system transformations”. This project is focused on uDig and Geotools. FOSS4G2006 - Free And Open Source Software for Geoinformatics Posters Jan Jezek h.jezek@centrum.cz Jan Jezek h.jezek@centrum.cz <MaKaC.conference.ContributionType object at 0xb3bfc52c>