Adobe Dreamweaver CS5.5 for Mac is a powerful web interface design editor for Mac that supports HTML, CSS, and PHP. Dreamweaver allows you to create web pages using a powerful visual editor, or by directly editing code. It is compatible with many popular content management systems, including WordPress, Joomla!, and Drupal.
In addition, Adobe has made it much easier to design for smartphone & tablet browsers as well as native iOS and Android apps. A Multiscreen Preview panel lets you style and visualize rendering for a range of devices in a single panel. Using the open-source PhoneGap framework, you can build and package native apps for Android and iPhones and convert your existing HTML to a mobile phone app.