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The Google Cemetery - A list of dead Google products and why they died
W3C Markup Validation Service - Validates HTML markup of web pages, one at a time.
Startup Graveyard - History shouldn't have to repeat itself
Total Validator - Total Validator can check your website to help ensure that it is accessible, uses valid HTML and CSS, has no broken links, and is free from spelling mistakes.
Killed by Google - Killed by Google is the open source list of dead Google products, services, and devices. It serves as a tribute and memorial of beloved services and products killed by Google.
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.