GTmetrix - GTmetrix is a free tool that analyzes your page's speed performance. Using PageSpeed and YSlow, GTmetrix generates scores for your pages and offers actionable recommendations on how to fix them.
Dr. Link Check - Broken link checker with malware and parked domain detection
PageSpeed Insights - PageSpeed is addon for ...
BrokenLinkCheck - Free Broken Link Checker / Online Dead Link Checking Tool - find bad hyperlinks
WebPagetest - Run a free website speed test from multiple locations around the globe using real browsers...
LinkChecker - LinkChecker is a free, GPL licensed website validator.