PTC Arbortext Editor (formerly Epic).
SyncRO Soft <oXygen/> DITA XML Editor.
Leximation DITA-FMx (plugin for FrameMaker).
XML Editors Review by Bob Doyle (including 8 desktop editors)
DITA Tools from A to Z, Special Issue of STC Intercom Magazine, April 2008, by Bob Doyle (requires STC login)
