https://learn.khanacademy.org/khan-academy-kids/
World Book Kids
must be in Arkansas to use
Early World of Learning
A million plus images, recordings, and texts.
https://learninglab.si.edu/
OER instructional materials repository for K-12 educators in Michigan.
https://goopenmichigan.org/
https://www.oercommons.org/groups/kindergarten/1634/
Free training and professional development materials for K-12 educators.
https://www.mathematicsvisionproject.org/