oXygen XML Editor combines an easy to use visual editor with a powerful code based editor thus covering the needs of both authors that do not want to see the tags and XML gurus that want to have full control over their markup.  

DITA support comes built in consisting of

oXygen is a cross-platform XML Editor. Besides the top-of-the-line XML source editing support, it features a CSS driven WYSIWYG XML editing mode allowing the content authors to visually edit DITA documents. oXygen features include out-of-the-box integration with the DITA Open Toolkit and can be easily customized to match your DITA editing and publishing needs.

DITA Storm™ Developer (www.inmediusdita.com) is a full-featured DITA editing tool that enables authors to easily create DITA-compliant content in WYSIWYG mode regardless of their DITA or XML knowledge.  The editing environment is 100% browser-based, requiring no timely or costly client installations or updates, and is completely customizable for a superior DITA user experience.  Non-technical authors create structured content in a familiar environment while ensuring that the entire DITA documentation lifecycle is supported through easy integration into an exiting CMS.

Xpress Author for Microsoft Word is part of the In.vision DITA Enterprise Suite which is designed to allow organizations to broadly deploy DITA content creation and publishing. Xpress Author is an add-on product that seamlessly combines with Microsoft Word and does not affect Word functions - except when the author chooses to create an XML document.

DITA Studio is part of the In.vision DITA Enterprise Suite which is designed to allow organizations to broadly deploy DITA content creation and publishing. DITA Studio is an Integrated Design Environment for DITA, providing an application that was build from the ground up with DITA in mind.  DITA Studio supports enterprise or project level content modeling, a flexible user interface for profiling and other types of metadata management, and publishing through the DITA Open Toolkit.