Parental controls

List of content-control software
List of parental control software

Windows Vista: Set up Parental Controls
How does the Parental Controls web filter work

BEST FREE PARENTAL CONTROL SOFTWARE
Alternative to Qustodio: K9, Net Nanny, Norton Family
Xmarks Parental Control: K9, Norton Family, OpenDNS, Net Nanny, Safe Eyes, Parent Control Bar, Qustodio, Consumer Research Reviews, CYBERsitter, DansGuardian

Top Free Download.com Parental Control: Spyrix Keylogger,
*K9 Web Protection: Free Blue Coat, server with web interface, no per user account control
JuniorWatch 2011: Free, Standard ($2/month), Premium ($3), Ultimate ($5)
*Qustodio 2011: Free, Premium ($55/year)
WRAAC Parental Control Bar Free No Win8 or non-IE browser
Microsoft Family Safety (Windows Live Family Safety)
Internet Safety Safe Eyes 2006: $50
Net Nanny 2001: $40 (Monitoring Software)
CYBERsitter $40

*Norton Family Safety: Free, Premier ($50)
McAfee Family Protection: $50 (in McAfee)
Bitdefender Parental Control $30 (in Bitdefender Security) Free after rebate

Built-in Antivirus - Internet Security
*Kaspersky Internet Security - Parental Control, Mac support, Windows support, Free after rebate
eset Security - Parental Control
Trend Micro Security - Family Protection
Panda Security - Parental Control Free after rebate
Total Defense Security - Parental Control

Mac OS X: Parental Controls
iOS Restrictions builtin (Parental Controls)
Google Play Android Parental Controls

Public recursive name server,
CleanBrowsing Adult Filter, pay to customize
Dyn Internet Guide Oracle, not free blocking by categories, white/black lists
Norton ConnectSafe for Home - only fixed 3 filtering levels (Security, +Pornography, +Other) with different DNS IPs, no account login required, uses Dyndns
*OpenDNS Family Shield Cisco free customizable, Pre-configured to block adult content
Neustar Free Recursive DNS Family Secure blocking level, pay to customize

ufdbGuard - URL filter for Squid proxy server