This is a great HTML-editing program. You can add tags by using the menu, and the tags are color-coded by type. It also has Preview and Live Preview modes.
Preview opens the default browser with the html you wrote (saved or unsaved) and Live Preview opens a new window with both the source code and what the web page actually looks like, and as you type the code above the text appears below (you can't edit the web page section directly, only the code, although you can use the text for the clipboard.
It also includes a handy color selector that automatically adds the color code into the html code (so you don't have to memorize things like "75c075" to get THIS color, etc.
As an added bonus, it's available for FREE download HERE!