This is my list of free website analysis tools that will help you to see how you rank up! Bouncehost uses these as a sales tool as well as a metric for Drupal web development case studies. These tools measure social media presence, search engine friendliness, compliance, and a few other key metrics.
http://www.websitegrader.com - this service is provided by HubSpot and allows for you to grade your site on many search engine optimization factors and social media presence.
http://validator.w3.org - this boring little tool is great for making sure that your XHTML code is W3C compliant which can strongly influence your search engine friendliness.
http://builtwith.com - this awesome little tool tells you information about the development platform, server information, and will even tell you what CMS drives a site.
http://www.reactionengine.com - this ugly little british tool does some great analysis on all kinds of metrics important to page rank.
http://analyzers.pearanalytics.com - this tool gives you a rating out of 100 and a nice emailed breakdown of the analysis on many metrics.