IPFS - IPFS is the permanent web. A new peer-to-peer hypermedia protocol.
W3C Markup Validation Service - Validates HTML markup of web pages, one at a time.
BitDust - BitDust is distributed secure anonymous on-line storage, where only the owner has access and absolute control over its data.
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.
Web3 Storage - The easiest way to store data on the decentralized web.
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.