HTML Editor can be added to a PHP page, I have not tried adding it to a Drupal site, but I don't see where there would be a problem if the page is PHP.
Your friends over here at WebAssist! These Dreamweaver extensions will assist you in building unlimited, custom websites.
These out-of-the-box solutions provide you proven, tested applications that can be up and running now. Build a store, a gallery, or a web-based email solution.