Yep!

Content Generation - Brain - Freeware.

Content Documentation - Thumbs and Fingers - Shareware, assuming you sometimes shake hands with other people.

Not the solution you wanted to hear I am sure, but the above are the best software you have available to you.

Onya
Woz

Great Woz!
.....but .....
just write your text .... if it's simple plain vanilla html is very simple and painless. You brain won't hurt too much ... and there's just a few more characters to type in the appropriate space .....
and abracadabra ... mystory.txt becomes mystory.html ..... all in your favorite text editor ... yep no added expenses! plenty of html tutorials available for free .....
¦bienvenido!

It depends on what you mean "convert to HTML". If you are going to actually post the article on a website, the CMS will let you enter text, format it, and convert it to HTML when you post. If you are composing in Word (or other word processor with formatting commands) it may have a "save as HTML" feature. (The code may or may not be what you want, of course.)

My simple solution: Set up a WordPress (free) blog either locally or in a private folder on a website. Use the WYSIWYG editor to format your text, and then post it to both convert it to HTML and organize your articles by category.

Note that today, formatting relies more on style sheets rather than embedded HTML formatting.

Thanks for your comments. I'm currently using notepad and hand coding to html. Its a pain to shuffle the content around, work with keywords, spell check etc. I thought there might be an all in one software solution to manage the writing process - guess not.

I use dreamweaver for it. There are plenty such application many free.

As another poster said what you need is a content management system or CMS. You can find try some free ones out at opensourcecms . If you are just looking for an html editor perhaps the wysiwyg kind like seamonkey composer would do or a manual one like html-kit .

I use NVU for stand alone web pages - its free. Netscape Navigator also has a simple html editor. And I use Drupal for CMS