• The Free Software Foundation (FSF) is a nonprofit organization promoting Open Source Software. They advocate that the users have the freedom to run, edit, contribute to, and share the software. For more information please refer fsf.org

• Since 2001 the Free Software Foundation Europe (FSFE) has been enhancing users' rights by abolishing barriers for software freedom. They help individuals and organizations to understand how Free Software contributes to freedom, transparency, and self-determination. For more information please refer fsfe.org

• The Open Source Initiative (OSI) is a big supporter of open source software. They promote that software must be distributed with source code in order to allow the user to run, review, alter, enhance and modify the code for any purpose. For more information please refer opensource.org

• Sustainable Free and Open Source Communities (SFOS) is a community website for the discussion, creation, and evolution of Open source software. For more information please refer sfosc.org