iPad apps for Children?

What good iPad apps do you know for children? I am particularly interested in apps that tackle the theme of education, environment, and sustainability.

I am now working on an interactive story app that deals with sustainability, you can find it by searching for "children of the elements kickstarter".

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From my experience all the apps from Toca Boca are amazing for kids and very user friendly. Search for them on the app store to see their apps and games.

My son is only four so looking for some nice simple apps. Anybody know of a good coloring one?

Doodle buddy is great, also paper.


iPad