The Open Semantic Framework (OSF) is an integrated software stack using semantic technologies for knowledge management. It has a layered architecture that combines existing open source software with additional open source components developed specifically to provide a complete Web application framework. OSF is made available under the Apache 2 license. Some of the use applications for OSF include local government, health information systems, community indicator systems, eLearning, citizen engagement, or any domain that may be modeled by ontologies.