Curriki is an online, free, open education service. Curriki is structured as a nonprofit organization to provide open educational resources primarily in support of K-12 education. Curricula and instructional materials are available at the Curriki website to teachers, professional educators, students, lifelong learners, and parents.
Curriki claims to have thousands of ressources and an API. I therefore gave it the subtype "repository". Nevertheless, it also claims to be a community.