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Knowing If Linux Is Right For You: Page 4 of 8

FILTERING TOOLS

DansGuardian is a Web content filter that blocks sites based on a variety of methods, including phrase matching, URL filtering, and PICS, a content rating system endorsed by the World Wide Web Consortium. The filter runs on several open source operating systems, including Linux, FreeBSD, OpenBSD, and NetBSD, as well as Mac OS X and Solaris, a Unix-based OS sold by Sun Microsystems.

SquidGuard filtering software can limit Web access to a list of acceptable Web servers or URLs. The freeware can also block URLs matching a list of regular expressions or words; allow IT staff to set access levels based on time of day, day of the week, and date; and enforce different rules for different user groups.

ATutor is a Web-based content management system that enables educators to quickly assemble instructional materials for posting on the Web. An ATutor course site includes chat rooms, assignment pages, and search tools.

Fabula, a free software package for teaching foreign languages, lets students and teachers combine images, sounds, and texts in two languages into interactive stories.