Listly by Brian Kessman
Source: http://www.smartcontentcreators.com/seo-audit-tools/
WooRank is the most popular Website Review and SEO Tool. Run a free Review. Then create a Project to track and optimize your website.
Free and online website review and SEO audit tool. Quick and simple Search Engine Optimization audit tool and website review of any web page.
Wordtracker offers Keyword Research tools for SEO and PPC, Rank Tracking and Site Analysis tools.
SeoTools for Excel requires the "full" Microsoft .Net framework installed. You need the right version of SeoTools for your Excel installation or the add-in won't work at all. Figure out if you're using 32bit or 64bit version of Excel.
This online tool checks the images on a webpage to see if they are optimized for search engines.
This tool checks to see if a webpage supports the If Modified Since HTTP header.
Mark up your bread crumbs with rich snippets for richer Google search results.
Free web analytics SEO tools providing website review and analysis in search engine optimization, performance, validity, security, accessibility and more
Site Auditor helps you identify the SEO health (and problem areas) of a website. It looks for errors about visibility, meta data, links, content, images and more. The overall audit score will reflect how well the website performed in terms of potential errors and number of pages with errors.