OpenStax Chemistry Second Edition by openstax

Biology 2e from openstax

Concepts of Biology by openstax

The Free High School Science Texts: Studying the Sciences: Chemistry Grade 10-12 by openstax

Everything Science Gr-12 Physical Science Textbook by volunteers

Everything Science Gr-11 Physical Science Textbook by volunteers

Everything Science Gr-10 Physical Science by Siyavula and volunteers