proxy for mac and windows [closed]

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I have a requirement that I need to restrict my kids from browsing some sites . I want to be the adminbstrator for my machine, but other users have limited access to internet. Is there any software / proxy for this ? i want solution for both windows / linux and mac

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My brother managed his daughters' access on Macs like this:

• Restrict Safari from going to sites not in the Bookmarks
• Only an administrator can create bookmarks
• His user is an administrator; theirs aren't.

Kids can be pretty smart, though, and once they're sufficiently motivated to figure out how to get around your access controls it's not worth continuing the arms race.