I've made this page and all the SEO tools in context of my diploma thesis. The fundamental idea was to build lots of useful tools that can be used by everybody to learn, understand and improve. All these tools are for free and I keep on trying to use no commercial advertising.
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Email sent automatically if PageRank is updated, checks if PageRank is valid, PageRank from multiple datacenters, checks PageRank with and without "www", displays number of backlinks, alexa ranking, and DMOZ links.
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