This site has at least 500 free SEO Tools listed and they are all rated by users and sorted so that the  best Free SEO tools are listed towards the top.  I love it.  I have never seen such a comprehensive selection of keyword tools, google tools, link checker tools, rank checker tools, submission tools and more.  Now I can go to just one place.  Check it out.

The title tag is arguably the single most important meta tag in regard to on-page optimization. Actually, it’s important on 2 fronts. Both as an SEO metric for ranking, and as one of the first things a potential clicker will see.

Link Extractor
Extract links from a specific web page.

HTTP Headers
Extract the HTTP Headers of a server. Find out exactly what your browser reads.

HTML Optimizer
Get rid of all those extra white spacing in your HTML websites using this tool. Optimize your sites for faster load.

Compare two web pages

Type the two URLs you want to compare in the form below, then press CHECK.

Duplicate Content Check