[cycomanic]

Khan academy kids is one of the goto things we are using, they also really like tuxracer. Generally I try to limit screen time and try many offline games (I can recommend moebius noodles and avoid hard work has books for mathematically inspired games).

[gingerlime]

+1 for Khan Academy kids. My 6 year old is not a native English speaker, but his English (+maths) really improved after using it. He also learned some stuff about animals and a few other things. It's really well made. It has some gamification elements that are very sweet and keep him motivated. I wish there something even close for other languages.