Mac users interested in Xhtml and css editor and creator generally download:
PageSpinner is an all-in-one PHP, HTML, CSS editor designed for web developers. The application includes multiple HTML, JavaScript and CSS code examples as well as a built-in assistant for quickly editing different sections of a webpage. With this tool, you can create HTML pages from scratch and publish them to a web server.
With SEEdit's fast and powerful Editor Toolbox, insertion of code and classes is always just one click away. Its handy, advanced Tag Editor also handles CSS classes and JavaScript functions. Other powerful features include Tidy Checker for standards-compliant code, the Quick CSS Tool for rapid CSS development, extensive multi-language support and auto-complete. SEEdit also support other editors like BBEdit, TextWrangler, TextEdit, and Dreamweaver.
BlueGriffon features a simple interface, suitable for the beginner and advanced user too, since the workspace is divided in two sections, wysiwyg (what you see is what you get interface containing insert object menus and buttons) and source(language code editor).