SiteAuditTool.com - Generate Website Audit Reports
LinkChecker - LinkChecker is a free, GPL licensed website validator.
SEO PowerSuite - Get all SEO tools in one pack - download free edition of SEO PowerSuite and get top 10 rankings for your site on Google and other search engines!
Pulno - SEO Audit and Website Analysis. Pull up your SEO.
SiteCheckerTool.com - Website Analytics & Tools
Dead Link Checker - Check for broken links on any website