Anyone here had much experience w/any of them compared to the paid alternatives? Some of the popular options I've found are: http://www.safesquid.com (free 3-user business edition) http://parentalcontrols.aol.com http://onlinefamilyinfo.norton.com http://www.k9webprotection.com http://dansguardian.org Dansguardian is a little different than the others, but it is free/open source, so it made sense to include it. Note that I've specifically left out the Microsoft offering. I'm running DD-WRT on my router if anyone is using router based filtering and would like to weigh in on that. My requirement would be to NOT filter a few devices (computers, phones, etc.), but filter all others. I can give them static IPs based on Mac addresses if necessary. Right now I'm just using OpenDNS, and it's ok, but good sites can sometimes have objectionable content, and OpenDNS would let it slip right through. Kids ages are 3, 4, 7, 8. They currently use a single machine w/logins for each child. It would be great to get the niceties the paid products offer (daily activity emails, etc.). Are you aware of any continually (community) updated, free URL blacklists? Better yet, any categorized lists?