Arty the Part Time Astronaut - Go on a learning adventure about the solar system! Filled with fun activities, games, and other neat stuff to help you learn about the planets
Any

Elf Island - virtual world where kids play games to make the real world a better place! Elf Island is launching soon, and you can be one of the first to live the island life! Play amazing games that help real people, animals and the earth. Create an Elf that walks and flies. Live on your very own island. Chat, trade and meet awesome animals!
Any

Fun Brain - Fun games to play for kids online
Any

Games Galore for Kids - A collection of online games for kids of all ages.
Any : 6 - 10

JigZone - The JigZone is the place on the internet for free online jigsaw puzzles
Any : 3 & up

Kids Computer Games - Free Download Computer Games for Kids.
Any

Kids Domain - PC and Mac Shareware and Freeware Programs for Kids recommended by families and teachers. Demos, reviews, programming for kids, and graphics. Holiday pages with mazes, puzzles, software, and crafts.
Any : 3-12

Puzzability.com - Not your typical word searches or dot-to-dots; this site contains much more. There are crossword puzzles, word games, and picture puzzles that are great brain teasers and mind benders. All puzzles contain humor, play value, and solvability.
Any : 12 & up