webhint : webhint is a linting tool that will help you with your site's accessibility, speed, security and more, by checking your code for best practices and co...
PURL : PURLs are persistent URLs, they provide permanent addresses for resources on the web.
Browsh : Browsh is a fully-modern text-based browser. It renders anything that a modern browser can; HTML5, CSS3, JS, video and even WebGL. Its main purpose is...
Waybackpack is a command-line tool that lets you download the entire Wayback Machine archive for a given URL.