[hamed]

dont post your site url on irrelevant or random sites to increase backlink count. Google ranking has gotten much smarter. they now detect relevance and good context wignal. You will only end up hurting your current rank if you post your links all over, indiscriminately.

That is not SEO anymore.

yes i know . but there are some valid sites that will work correctly.

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I'm not sure what exactly do you mean by free BackLink sites. Do you mean by the sites which simply gives you a back-link or you enter your domain name and they give you bunch of backlinks ?

yes some sites like whois . seo rank cheker . site server status . alexa cheker . 
this is free backlink sites and my mean