Edit php html source code in individual pages.

Are there any plugins that let you edit the html code gathered from the php in individual pages?

I don’t want to edit the main page code that’ll edit every page, just individual pages. I know there are plugins that add a blank html block but Im looking for one that will display the coding already on the page so I can add or remove things for the specific page. Also I’m hoping this will work for bbpress forum pages as well. Such a thing?