ABC mouse
https://www.abcmouse.com
A step by step learning path presents children ages 2-7 with curriculum work in reading, math, science, art & colors and music. As children complete each lesson, they are guided to the next one and are motivated by tickets and reward systems. This program is free for 30 days.
PBS Kids
http://pbskids.org
Educational shows your children know and love have their own online learning section. Sing-a-long songs, sorting and counting games, coloring and more are all part of this fun and engaging website appropriate for students in PreKindergarten and beyond.
Sesame Street
http://www.sesamestreet.org
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.