Search for free, standards-aligned STEM teaching resources.

CK-12 provides open-source content and technology tools to help teachers provide learning opportunities for students globally.  Free access to high-quality, customizable educational content in multiple modalities suited to multiple student learning styles and levels will allow teachers, students and others to innovate and experiment with new models of learning. CK-12 helps students and teachers alike by enabling rapid customization and experimentation of teaching and learning styles.