Great projects
Khan Academy is a non-profit educational organization created in 2006 by educator Salman "Sal" Khan with the aim of providing a "free, world-class education for anyone, anywhere". The organization produces short lectures in the form of YouTube videos. In addition to micro lectures, the organization's website features practice exercises and tools for educators. All resources are available for free to anyone around the world.
The CK-12 Foundation is a California-based non-profit organization whose stated mission is to reduce the cost of, and increase access to, K-12 education in the United States and worldwide. CK-12 provides free and fully customizable K-12 open educational resources aligned to state curriculum standards and tailored to meet student and teacher needs. The foundation's tools are used by 38,000 schools in the US, and additional international schools.
OpenStax CNX was Founded as Connexions in 1999 by Richard Baraniuk. OpenStax CNX is based on the philosophy that scholarly and educational content can and should be shared, re-used and recombined, interconnected and continually enriched. As such, it was one of the first Open Educational Resources (OER) initiatives along with projects such as MIT OpenCourseWare and the Public Library of Science. The materials in Connexions are available under a CC-BY Creative Commons license
OER Commons, created by the Institute for the Study of Knowledge Management in Education, was developed to serve curriculum experts and educators in discovering open educational resources (OER) and collaborating around the use, evaluation, and improvement of those materials.[1] Resources on the site can be searched and filtered using an expanded set of descriptive data, including conditions of use. Teachers, students, and others enrich this "metadata" when they tag, rate, and review materials, and share what works for them.