K9 Web Protection is a completely free and very easy to use piece of software for filtering web traffic. It installs very quickly and sits in the background and does not appear to slow down your web browsing. It blocks 24 categories of websites including porn, gambling, and nudity. It also forces ‘safe search’ mode for search engines like Google or Bing.
If a child (or adult) tries to access a blocked site, the program displays a warning page. You are given the option to enter the parental Supervisor password to allow access to the site for a fixed time or permanently. K9 can also play the sound of a dogs bark over the speakers to alert you that a site has been blocked. You can also schedule internet access on a computer for example allow access for 60 minutes or enforce a night time curfew.