http://www.marketleap.com/publinkpop/
Link popularity check is one of the best ways to measure awebsite's online awareness and overall visibility. Link popularity refers to the total number of links or "votes" that a search engine has found for your website.

Marketleap has designed this link popularity tool to help website owners find out who is linking to their site, but also to give a useful benchmarking report to quickly show where you stand in comparison to competitors and other major online players

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http://www.seomoz.org/page-strength
This tool identifies:
The Relative Importance and Visibility of a Webpage The Potential Strength and Ability of a Page to Rank in the Search Engines Data on Popularity, Links & Mentions of the Page Across the Web

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http://www.xml-sitemaps.com/index.php
Create an XML sitemap format that can be submitted to Google to help them crawl your website better.
Create a Text sitemap to submit to Yahoo.
Create a ROR sitemap, which is an independant XML format for any search engine.
Generate an HTML site map to allow human visitors to easily navigate on your website

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http://www.dead-links.com/check_links.php
Put your website or weblog home page URL in the input box and a little spider will read the html code and check for the broken links.

The spider splits links in two categories, internal, from the same host, and external, outgoing link to different domains.

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