SiteCheckerTool.com - Website Analytics & Tools
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.
A1 Website Analyzer - Analyze websites and save data into XML, CSV etc. Extract data about internal linking and importance calculations, file sizes, download times, HTML validation errors etc. across entire websites.
Dead Link Checker - Check for broken links on any website