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W3C Markup Validation Service - Validates HTML markup of web pages, one at a time.
Startup Graveyard - History shouldn't have to repeat itself
HTML Validator - HTML Validator is a Mozilla extension that adds HTML validation inside Firefox and Mozilla.
KNOW App - KNOW is a leading mobile productivity platform helping companies digitize daily checklists, tasks, shifts, attendance, data collection, and much more.
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.
Zenput - Zenput is a task and operations management software for restaurants and stores.