ICRA The Internet Content Rating Association (ICRA) uses a self-rating system, meaning webmasters put code in the source HTML of a page that lets filters know if there is pornographic content on that page. Internet Explorer can read the labels and not allow certain webpages to be downloaded. See Microsoft's Content Advisor on how to enable this. This site, pornstudies.net, has ICRA labels.

NetSafeKids Provides information on types and sources of sexually explicit content, ways that inappropriate material can reach children, the pros and cons of filtering and monitoring tools, and other issues involving Internet safety. From the National Academy of Sciences, 2003.

Computer Professionals for Social Responsibility - Filtering FAQ Attempts to describe the concerns and issues raised by the various types of filtering software.

Youth, Pornography, and the Internet There is no single solution for protecting kids from internet pornography. By the NATIONAL RESEARCH COUNCIL and INSTITUTE OF MEDICINE (2002)

Filters: BsafeOnline, BESS, BrowserLock, Cyber Patrol, ContentProtect, CyberSentinel, CYBERsitter, Cyber Snoop, DansGuardian, EnoLogic NetFilter, FilterPak, Internet Filter IF-NOT, iProtectYou Pro Web Filter, Net Nanny, Safe Eyes, SmartFilter, SurfControl, WebSENSE, 8e6 (X-Stop).

The Use of Filters is Challenged

OpenNet Initiative "The ONI mission is to investigate and challenge state filtration and surveillance practices."

Internet Free Expression Alliance Believes content filtering is inconsistent with free speech.

Mainstream Loudoun District Court case Summary, court opinions, and other material concerning the first legal challenge to the use of filters in public libraries.

The Censorware Project "Our goal is to bring to light information about censorware products which is, by its nature, hidden." Reports on  Bess, Cyber Patrol, Smartfilter, WebSENSE and X-Stop.

Peacefire "Created in 1996 to represent the interests of people under 18 in the debate over freedom of speech on the Internet." Reports on BESS, Cyber Patrol, CYBERsitter, I-Gear, Net Nanny, SmartFilter, WebSENSE and X-Stop.