Webmaster tool showing list's of Meta Descrioption (Duplicate, Long and Short Descriptions) and Title tag (Missing, Duplicate and Long Title)for a website.

If you find such data useful, take a look a A1 Website Analyzer as well:
http://www.microsystools.com/products/website-analyzer/help/site-analysis-seo-audit/

Thanks for this post.

Google Webmaster tool is really one effective SEO marketing tool which one helps to know about Site errors. You can easily fix your site problems from the help of Google webmaster tool.