Hi!
I am dumbfounded by the lack of internet safety software available for free. I mean, if developers can produce a distro of GNU/Linux for every taste possible, surely keeping kids from harm in the web is also a worthy project. A few parental control software I found so far ....
http://www.safefamilies.org/
http://www.parentalcontrolbar.org/
http://www.crawlerparental.com/
Found some too?
I doubt you will find many free softwares because the developers know that parents serious about protecting their child from dangers on the internet would not mind paying for the software. The same is the case with Anti-virus softwares.