Screaming Frog SEO Spider - The Screaming Frog SEO Spider is a small desktop program (PC or Mac) which crawls websites’ links...
Dead Link Checker - Check for broken links on any website
Netpeak Spider - A desktop tool for fast and comprehensive technical audit of the entire website.
BrokenLinkCheck - Free Broken Link Checker / Online Dead Link Checking Tool - find bad hyperlinks
Pulno - SEO Audit and Website Analysis. Pull up your SEO.
LinkChecker - LinkChecker is a free, GPL licensed website validator.