Dear colleague, this July we attended the ICME conference in Mexico which was very successful. However, we encountered some criticism from commercial software developers. It was suggested that the development of open-source software is not sustainable solely by a user community. We would like to reflect on these issues and write a report describing the work that has been done in local communities, especially in communities where access to software resources is limited. We would be grateful if you could send us a short (2-3 pages) description of your activities and how GeoGebra impacted the use of technology and quality of mathematics teaching and learning in your institutions and/or countries to markus@xxxxxxxxxxxx or zsolt@xxxxxxxxxxxxx It would be great if you could write about: 1. Your past and current activities, and your future plans concerning the use of GeoGebra 2. How do you think open-source software impacted mathematics teaching and learning in your institution/country? 3. What are the benefits of using open-source software in mathematics teaching, learning, and teacher education in your institution/country? Also, if you have written any papers/reports describing your activities please send them to us if possible. We would love to include them in the publication list on the GeoGebra website (see http://www.geogebra.org/en/wiki/index.php/Publications). Also, if you know about any papers/reports about GeoGebra that are not included in this list could you please send us a reference? Your contributions would be an enormous help for us and it could greatly improve the credibility of GeoGebra and assist the sustainability of our project. During the upcoming year, we hope to submit some grant proposals to be able to assist GeoGebra activities around the world. If you have any ideas please share them with us and if you need any help for applying for funding let us know and we will try to assist you. Thank you so much for your support! Kind regards, Markus and Zsolt Markus Hohenwarter, markus@xxxxxxxxxxxx Zsolt Lavicza, zsolt@xxxxxxxxxxxx