Uptoten is a learning website with hundreds of fun educational games and activities for children aged up to 10 that challege the mind, encourage creativity, help with problem solving, and stimulate memory development among other skills.
Many of them are useful to try to teach English to little kids. Games are organized by age (0-6/ 6-10) so you can find the best online games for your child.
A very good tool and a creative way to learn and practice English.
On Twitter: https://twitter.com/uptotenkids