https://unctv.pbslearningmedia.org/collection/btl07-ex/ good site for K-2
https://www.starfall.com/h/ K-3
https://ell.brainpop.com/
https://www.readingbear.org/
https://www.funbrain.com/ K-8 reading and math learning games
http://www.esl-kids.com/eslgames/eslgames.html not online games, but lots of ideas for games to play in class or at home to practice English
http://www.eslgamesworld.com/members/games/levels/ upper elementary - advanced/high school
Other fun apps/sites for elementary age children; www.cookie.com, www.peppapig.com,