Parental controls for Edubuntu?

[Robert Citek]

Hello all,

ByteWorks[1] refurbishes donated computers and gives them to  
underserved youth who have gone through the Earn-A-Computer program.   
Since our target audience is between the ages of 9 and 13 years, many  
parents have expressed a desire to have "Parental Controls" installed  
on the machines, something like CyberPatrol[2] or NetNanny[3].  Do  
"Parental Controls" exist for Linux, specifically for Edubuntu?   
They'd be willing to pay for such a service.

[1] http://bworks.org/
[2] http://www.cyberpatrol.com/
[3] http://netnanny.com/

Regards,
- Robert
robert.citek at bworks.org
http://stlouis.missouri.org/bworks/