LinkChecker - LinkChecker is a free, GPL licensed website validator.
SiteCheckerTool.com - Website Analytics & Tools
DRKSpiderJava - DRKSpider is an open source website crawler (sitemap generator) and link checker. Features:
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
SiteAuditTool.com - Generate Website Audit Reports