Protecting Children on the Internet- How can I block sites?

My mom has a daycare, and we noticed 1 older child, 11, was looking at stuff he should not look at, I mean, you can't have your eye on the child at every second. Is there a program my mom can buy or even another cheaper way of doing it, to block him from certain sites, or to allow access to only certain websites? I heard of Netnanny, are there others?

At a daycare your mom and you should not let the kids go on a computer. But anyways you should find out he site to download firewall. Its eaasy to use too. You can type in the sites the children can go on or you can click on options and there is choices of block naked girls block site with searing and stuff like that.

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