From LQWiki

ufdbGuard is:

• a URL filter to block unwanted web content
• the fastest URL filter
• detects proxy tunnels dynamically
• free, open-source software
• based on SquidGuard.

ufdbGuard supports:

• the Squid web proxy.

External links

• http://www.urlfilterdb.com
• http://sourceforge.net/projects/ufdbguard/