Quanta Plus is an HTML development tool like Kompozer. Quanta Plus can perform coding using WYSIWYG and manual coding, in addition it supports: HTML, XHTML, CSS, XML (or XML platform languages) and PHP. Quanta Plus includes many types of tags, project management, visualization, PHP debugger, CVS support, Subversion support. While Kompozer is aimed at inexperienced users, Quanta Plus is aimed at experienced users who want a professional WYSIWYG editor.