CK-12 Foundation
CK-12 app provides schools free, full curriculum for Middle School, High School Science and Math. All content is fully aligned to CCSS, NGSS and all 50 individual state standards. This includes ~100+ digital textbooks (customizable) and ~5000 Science and Math concepts.
CK-12 Foundation offers SSO through Clever Instant Login
CK-12 Foundation rosters and provisions accounts through Clever Secure Sync