The Sabbath School Quarterly
https://adventech.io/sabbath-school
The Great Controversy
Book in written form
https://greatcontroversyproject.org
Audio Version:
https://ellenwhiteaudio.org/great-controversy
Lineage offers the book in media episodes:
https://lineagejourney.com/episode_category/the-great-controversy
Lineage is a multi-faceted educational experience that endeavors to take you on a journey showing the stories from our past heritage; the experiences, convictions, sacrifices and commitments of our spiritual forebears that make us who we are today.