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Reference.org
Comparison of content-control software and providers
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<p>This is a list of content-control software and services. The software is designed to control what content may or may not be viewed by a reader, especially when used to restrict material delivered over the Internet via the Web, e-mail, or other means. Restrictions can be applied at various levels: a government can apply them nationwide, an ISP can apply them to its clients, an employer to its personnel, a school to its teachers or students, a library to its patrons or staff, a parent to a child's computer or computer account or an individual to his or her own computer. </p>