E-Learning for Kids is a “global, nonprofit foundation dedicated to fun and free learning on the Internet for children ages 5 – 12.”
They offer free online courseware in maths, science, PSHE (Life Skills), literacy and computing skills.
There are plenty of online Flash-based resources here. Some would work well on an IWB (a full-screen option would be handy), but they would be good for independent study, with pupils working through them at their own pace too. Resources look suitable for KS1 up to KS3.
Resources are available in English and also Dutch, Spanish, French and Portugese. The resources are free – you can donate if you wish, but you don’t have to.