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HTML Validator - HTML Validator is a Mozilla extension that adds HTML validation inside Firefox and Mozilla.
Integrity - Feature comparison of link checkers for Mac: Integrity, Integrity Plus and Scrutiny
W3C Markup Validation Service - Validates HTML markup of web pages, one at a time.
Xenu's Link Sleuth - Xenus Link Sleuth checks Web sites for broken links.
Rocket Validator - Site-wide Accessibility and HTML validation made easy. With a single click, Rocket Validator will check thousands of web pages on your site for Accessibility and HTML conformance, producing a detailed, actionable report on seconds.
Screaming Frog SEO Spider - The Screaming Frog SEO Spider is a small desktop program (PC or Mac) which crawls websites’ links...