Wikipedia
XFDesigner
XF Designer is a document layout editor based on XSL-FO. Its primary purpose is to eliminate the complexity of building XSL-FO templates by providing a What You See Is What You Get (WYSIWYG) way to do this.
XF Designer uses the same XSL-FO formatting engine as Ecrion XF Rendering Server, a cross-platform engine compliant with XSL-FO 1.1.