Each of the educational shows your children watch on PBS have their own learning section through PBSKids.org. Try sing-along songs, sorting and counting games, watch videos and more.
Scholastic is one of the more unique educational websites for kids on this list. This site, from the publishers of the educational books you find in schools, contains activities broken up by grades. Pre-K all the way up to seniors in high school can find learning activities geared toward them.
Younger children will love everything about Sesame Street's online home. They can choose from hundreds of the show's video clips and play games that help them learn letters, animal sounds, rhymes, colors and more.