FOSS4G is the world's largest conference dedicated to open-source geospatial software, organized by the OSGeo Foundation.

FOSS4G is the world's largest conference dedicated to open-source geospatial software, organized by the OSGeo Foundation. In 2026, this global FOSS4G event will be held in Hiroshima, Japan. Geospatial technology empowers communities to address real-world challenges such as disaster response, urban planning, and environmental resilience. At FOSS4G Hiroshima 2026, we will further highlight the humanitarian applications of open-source geospatial technologies — from supporting refugees to preserving cultural memory.