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HTML Validator - HTML Validator is a Mozilla extension that adds HTML validation inside Firefox and Mozilla.
LinkChecker - LinkChecker is a free, GPL licensed website validator.
W3C Markup Validation Service - Validates HTML markup of web pages, one at a time.
DRKSpiderJava - DRKSpider is an open source website crawler (sitemap generator) and link checker. Features:
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.
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.