CoolMath.com
A math website that offers both homework help and interactive games
PBSkids.org
Educational games and videos based on the PBS characters
GettyGames
Games based on the art in the Gettysburg art museum
JMathpage
Multiplication help videos and other educational math games separated by grade level
Sesamestreet.org
Games geared toward preschool and elementary students
National Geographic Games
Science based educational games and videos
Starfall Games
Games and activities based on reading development for kindergartners and preschoolers
Funology
Games and activities to do offline