This solution is suitable for parents who can't afford to buy the "net nanny" product. No installation is required.
What is ScrubIT?
ScrubIT is a FREE recursive DNS server that regulates what comes into your home or business. ScrubIT “scrubs” the internet so you don’t have to be concerned about what your family members or employees will be confronted with.
Who should use it?
ScrubIT is perfect for any home or business that is tired of the plague of pornographic and malicious websites.
Why is it FREE?
You're saying "Where's the catch?", good news, there is none! As far as we know, ScrubIT is the only public recursive DNS server to actively filter pornography. It’s a FREE service provided by people who care about the freedom found in the internet, but balance those sentiments with a desire to protect our children and employees.
*Summary were copied partially from ScrubIT website.