Download Kid Browser
If you are worried about your children surfing the internet and visiting sites that are not appropriated for them, Kid Browser is one of the best parental control applications you will be able to find. With this tool your kids can surf the Internet in the safest way ever and learn all kinds of educational subjects at the same time.
It's fully customizable and it lets you configure which sites your children can visit and which ones don't. It comes with an accessible interface but not for everybody. It can be password protected and keep its configuration menus away from your children's eyes.