Você pode procurar algo como NetNanny
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Internet Filtering
Net Nanny can block not only pornography, but hate sites, questionable chat rooms and other dangers of the Internet. You can configure Net Nanny to block online game and gambling sites, and even make it so your children can only install and play computer games with parental ratings that you deem appropriate.
Net Nanny even offers a simple, easy to use set-up assistant to help parents determine what online activities (Web sites, chat, gaming and social networks) are appropriate based on your family member’s age.