Not a parent, but I did build parts of OpenDNS's content filtering offering. You can point your routers DNS to 208.67.222.123 and 208.67.220.123 to get a basic

Not a parent, but I did build parts of OpenDNS's content filtering offering. You can point your routers DNS to 208.67.222.123 and 208.67.220.123 to get a basic level of filtering for the most obvious porn, malware, and phishing sites. More fine grained network controls come with an account.