Star Fall - Phonics, reading, language arts, math

https://www.starfall.com/h/

ABC YA - Practice math and reading skills while playing fun games!

https://www.abcya.com

Squiggle Park - Reading games

https://www.squigglepark.com

Nat Geo Kids - Learn about geography and animals 

https://kids.nationalgeographic.com

Fun Brain - Play games while practicing math and reading skills

https://www.funbrain.com

Seussville - Read, play games, and hang out with Dr. Seuss and his friends!

https://www.seussville.com

Highlights Kids - Read, play games and conduct cool science experiments

https://www.highlightskids.com

Scholastic - Day by Day projects, books and more

https://classroommagazines.scholastic.com/support/learnathome.html