http://www.w3.org/Amaya/User/BinDist.html
Amaya is a WYSIWYG HTML editor. It's produced by the people of W3C,
the people behind web standards. It also checks if your codes are
compliant with W3C, so it saves you time of going to the website to
check.
As a side note, Amaya relies on OpenGL for rendering graphics... so
if your graphics card specs is low, it either will crash or will be
very slow...
In this case, use another editor.
Available for Windows, Mac and Linux.