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http://www.squidguard.org/
http://sgmanager.sourceforge.net/
http://www.safesquid.com/
http://dansguardian.org/
http://www.quintolabs.com/qlicap_download.php
http://calamaris.advproxy.net/
http://www.smoothwall.org/
http://calamaris.advproxy.net/
http://www.ipcop.org/

Distribuciones dedicadas:
http://www.clearfoundation.com/Software/screenshots.html
http://www.zeroshell.net/ss/
http://www.zentyal.com/es/