FreeProxyLists.com is a database of free working proxy server lists. And contains proxy related links and tutorials.
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Proxz.com is a daily updated list of really functioning free public proxy servers plus proxy related information and tutorials plus an a extensive forum community.
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ForaStat is a free tool which helps analyse websites and estimate valuation including such as Search Engine Reports, Traffic Reports, Social Engagement, Safety, Host Information, Domain WHOIS, Page Speed and much more.