If you are looking for a free and easy to use solution for you or your clients to manage a web site, I suggest you to try PageLime. PageLime is a remote Content Management System that allows you to manage web sites update the content, images, and documents without installing any software and only using CSS classes to mark which areas of your site are editable.
After creating your account, you have to register the web site you want to manage and mark up editable areas using the class cms-editable (you can also use a custom name for this class). In this way, you or your clients will be able to modify all marked areas using the PageLime WYSIWYG editor, without modify directly the HTML code of your pages. For example, if you want to make an header editable via PageLime you can use this code:

Once you’re done with your edits, you can publish your pages with a simple click. PageLime is free, very easy to use and is an interesting alternative to other similar stand-alone applications. Here is a five minutes videos that illustrates more in detail how PageLime works.