Vocabulary, grammar
www.funbrain.com/words.html

.
www.harcourtschool.com

Nonfiction reading, individual student username and password
www.kidbiz3000.com

Grammar rules games and activities
www.learnenglish.org.uk/grammar/archive/grammar_games_index_page01.html

Collection of grammar games, antonyms, synonyms, parts of speech, plurals, etc.
www.mcssb.org/grammargames.htm

Sentences, capitalization, punctuation, parts of speech
www.eduplace.com/kids/hme/k_5/grammar