Wikiwijs is a national open educational resources (OER) initiative in the Netherlands launched in December 2008. It aims to stimulate the development and use of OERs, improve access to learning materials, and support teacher professional development. Wikiwijs provides a repository of OERs, a referatory of both open and closed digital resources, and tools for teachers to create and use learning materials. However, its technical infrastructure and metadata standards require improvements to better support scalability and interoperability across different educational sectors.