The NAEYC for Families website (Families.naeyc.org) has
valuable, practical, fun and inexpensive ideas that you can use to support 
your children’s learning.

Starfall.com
Children can play games with letters, letter sounds, reading and math activities.
http://www.starfall.com
ABCmouse
This website has many activities in Math, Reading, Music, Art and Science.                       
http://abcmouse.com                                                

Story Place
This website has fun books that you can read to your child and activities that go with them.
http://www.storyplace.org/preschool/other.asp

PBSKids 
http://pbskids.org                                                                                                               
Peep and the Big Wide World
http://peepandthebigwideworld.com/en/