Math playground - great math games http://www.mathplayground.com
National Geographic for Kids http://www.nationalgeographic.com/kids/
Panther Valley website http://www.panthervalley.org
Spelling City - Practice weekly spelling words http://www.spellingcity.com
Book Adventure website - the students are required to read two books a marking period and take tests for those books. http://www.bookadventure.com