My preferred HTML5 editor is Notepad++. Notepad++ is a free source code editor that supports several languages. Running in the Windows environment, its use is governed by GPL License.

There are other HTML5 editors available. Adobe’s Dreamweaver CS5 is the flagship among the commercial tools.

A list of some other useful HTML5 editors is shown below :

• Aloha Editor (semantic Rich Text Editor framework written in Javascript with best support of xHTML5)
• Rendera by Brian P. Hogan