Common Lit: Grades 3-5

https://www.commonlit.org/

News ELA: Grades 2-5

https://newsela.com/

ReadWorks: Grades 2-5

https://www.readworks.org/

Generation Genius: Math and Science for Grades K-5

https://www.generationgenius.com/

Zearn: Math Grades 2-5

https://www.zearn.org/

Starfall: Kindergarten

https://www.starfall.com/h/index-kindergarten.php