http://www.funbrain.com   (Language Arts games and more)
http://www.merriam-webster.com    (Merriam Webster Word Game of the Day)
http://www.vocabulary.com    (Vocabulary activities)
http://www.superkids.com/aweb/tools/words  (Vocabulary builders)

https://www.abcya.com/games/category/language-arts (Lots of different games to choose from)