Here is the one I use the most for making quick pages.
The best part about HTML and HTML5 is you can make the whole site offline and check it before you even upload it anywhere. It is always so slow to try and get a new WordPress site working or need to make a site when you can't be online for some reason. It always SUCKS to accidentally screw something up on a live site too. It is also easier and quicker to see your changes than to wait for the caching plugin, server side caching, and whatever else may make you wait to see what the changes did.
If you want a program, Kompozer or Blue Griffon are good, but really haven't been updated for a while when I last checked. These will do HTML. You can get a good base and add HTML5 elements to the code afterwards if you like.
Here is one that does get update and works fairly well. http://arachnoid.com...hilia/index.php
Here are these HTML5 Editors you can try.
I bought a program that creates a nice basic HTML5 site with nice effects a few years ago. It is online and is updated. I can use it for the basis of what I want to create by adding and tweaking once the basics are done. The sites end up being a few hundred K where a similar WordPress can consume nearly a Gig with plugins and the nasty habit it gets of caching a bunch of stuff as time goes on.
There are some new syntax for HTML5 that is pretty easy to get the hang of that makes it easier to do a webpage. There are plenty of free templates and boiler plates you can get and play around with. The REAL coolness with HTML5 is combining it with CSS3 to get some awesome effects. Still working on getting that one down. It beats the crap out of anything seen on WordPress so far.
if people are worried about their SEO, Google is looking for a fast loading mobile ready site. They get the higher marks and WordPress just isn't there yet without a LOT of custom tweaking most people have no ability to do on their own. Not to mention the added load on the server and extra disk space.
Have FUN playing with these!