W3C Markup Validation Service - Validates HTML markup of web pages, one at a time.
Gift Hunt for WordPress - Online treasure hunt on your WordPress site
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.
Treasure Hunt - A scavenger hunt app for kids, powered by machine learning
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.
Scavengar for iOS - Amped Labs UG limited liability .