Math:

www.ixl.com

www.arcademics.com

www.multiplication.com/games

https://www.factmonster.com/math/flashcards

https://www.funbrain.com/math-zone

Reading:

https://griver.org/- Great River Regional Library

https://clever.com/- CLEVER

www.dogonew.com

https://www.funbrain.com/games/grammar-gorillas

Other:

 www.seesaw.com