FlowMapp is a UX planning tool for creating visual sitemaps and user flow. FlowMapp is very effective for planning the development of a site, mobile or web app, and it allows all the participants in the process to collaborate with each other, which makes the workflow easier and more convenient.
HTML Validator - HTML Validator is a Mozilla extension that adds HTML validation inside Firefox and Mozilla.
VisualSitemaps - Autogenerate visual sitemaps in seconds.
W3C Markup Validation Service - Validates HTML markup of web pages, one at a time.
Rarchy - Plan your next website with Rarchy using our easy visual sitemaps & website planning tool. Collaborate in real-time with your whole team. Try us for free today!
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.
Octopus.do - Build your website structure in real-time and rapidly share it to collaborate with your team or clients. Start prototyping websites or apps instantly.