Math Playground offers a load of manipulatives for math concepts. The manipulatives are organized in topics such as Visual Division, Pattern Blocks, Percentages, and Equivalent Fractions to name but a few.
This site has online logic games that kids can play. Some are familiar (like Mancala), while others are unique to the site. I spent some time “researching” this site (geez, I love my job), and I think it’s a solid addition to the math resource toolbox. They don’t just have logic games, so even if logic isn’t the trigger for your child, there are other things worth looking at.