I need an easy to use CMS or other "system" for creating the architecture within a website that will allow me to manage adding 3-4 new articles each month. I'd like to be able to have them grouped by subject matter.

Normally, I would just create new HTML pages and edit a separate HTML page with a list of the article titles on it. But "there must be an easier way" as they say.

This isn't a blog. The articles really need to be organized by subject.

What have y'all used that you like?