http://pbskids.org/ PBS Kids contains sing-a-longs, counting and sorting games, educational videos, and so much more!
http://www.sesamestreet.org/ Check out this site to play games to help with letter sounds, animal sounds, rhyming, colors, and lots more!
http://www.abcya.com/kindergarten_computers.htm This is a great web page to practice letters, numbers, strategies, and skills. There is also a section for some holiday fun!
https://www.education.com/games/kindergarten/ This fun site is a great way to practice and learn all kinds of math and reading skills.
http://www.scholastic.com/ispy/games/ Do you like the Look and Find books? If you do, you will love this site!