CK-12

CK-12 is an excellent Open Educational Resource (OER) that is free and easy to use. Digital resources include PLIX interactives and simulations, adaptive practices, study guides, and FlexBook digital textbooks. CK-12 FlexBooks are complete online platforms for assembling, authoring, and distributing standards-aligned, interactive, multi-modal educational content.

ISTE’s Learning Keeps Going

A coalition of education organizations led by ISTE has curated free tools, strategies, tips and best practices for teaching online.