If you are into SEO, you need these tools for your analysis and monitoring of optimized sites. These are a must tool for every search engine optimizer. These will help you to become effective in your task.
This list is a compilation of free web tools and free seo tools.You can use these sites to check your website rankings, keyword analysis, pagerank checker, keyword density, backlink checker, meta tag analysis and generator, website info, keyword suggestion tool, link popularity, search engine position, website speed test, alexa traffic rank, domain checker, broken link checker, domain look up, ping test, search listing preview, spider view and others.
I'll update this list often to give you more free seo tools. You can use these tools for free, just go to their sites.