SiteCheckerTool.com - Website Analytics & Tools
Checkbot - Checkbot will boost the SEO, speed and security of your site by checking you're following 50+ web best practices. Browser extension with free and paid plans.
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.
LinkChecker - LinkChecker is a free, GPL licensed website validator.
SiteAuditTool.com - Generate Website Audit Reports
Pulno - SEO Audit and Website Analysis. Pull up your SEO.