We have gathered best HTML5 editors which will enable designers and developers within their given workflow.Hope they will fulfill your needs.
Maqetta is an open source project that provides WYSIWYG visual authoring of HTML5 user interfaces. The Maqetta application itself is authored in HTML, and therefore runs in the browser without requiring additional plugins or downloads.
Aptana Studio 3 is an open source development tool for the developers; it enables developer to test their web applications using single environment.
BlueGriffon is a new WYSIWYG content editor for the World Wide Web. Powered by Gecko, the rendering engine of Firefox, it’s a modern and robust solution to edit Web pages in conformance to the latest Web Standards.
Rendera is an online HTML5 editor which renders a realtime preview of your current work also transform your current work into CSS, Rendera supports HAML and SASS. Rendera makes learning HTML5 and CSS3 easy and it is built with CoffeeScript and Sinatra.