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Web filtering for the Squid proxy
http://www.quintolabs.com
http://www.quintolabs.com/support_center.php
http://www.howtoforge.com/tiny-web-proxy-and-content-filtering-appliance-on-centos-6-version-1.4
yum install wget
wget http://www.quintolabs.com/qlproxy/binaries/1.4.2/qlproxy-1.4.2-32d12.i386.rpm
yum localinstall qlproxy-1.4.2-32d12.i386.rpm