Microsoft Content Advisor
- Directions and instructions on managing PICS rules filtering in Internet Explorer.
- http://www.microsoft.com/windows/ie/ie6/using/howto/security/contentadv/config.mspx

Against labelling (ICRA/RSACi)
- The web site of an Australian opposed labelling systems designed for censorship.
- http://danny.oz.au/freedom/rsaci/

EFA: Content Rating and Filtering
- Information about and criticism of PICS and the ratings systems and ratings bureaus that use it.
- http://www.efa.org.au/Issues/Censor/cens2.html

Platform for Internet Content Selection (PICS)
- Technical specification, usage hints, and comments.
- http://www.w3.org/PICS/

Vancouver Webpages Rating Service
- Experimental PICS-based ratings service on scales with both positive and negative values. Among its categories: Multiculturalism, Educational Content, Environmental Awareness, Safety, Canadian Content, and Commercial Content.
- http://vancouver-webpages.com/VWP1.0/

SafeSurf
- Detailed self-rating standard, with categories for profanity, heterosexual themes, homosexual themes, nudity, violence, drug use, intolerance, and gambling, rated on a finely-graded 0-9 scale.
- http://www.safesurf.com/

Internet Content Rating Association
- Manages ICRA and RSACi self-rating systems. RSACi broadly rates sex, nudity, violence, and profanity on a scale of 1-4. ICRA specifically rates yes/no whether content contains specific types of chat, sex, nudity, violence, profanity, or drug use. [Self-ra
- http://www.icra.org/