Open eXeed is a Open Source development Environment for XML. It is used to edit, create, validate XML and other related documents, such as XHTML, XSLT.

Screen Shot

Screen Shot1
editing a xml file with treeview, data view, source view and browser preview.

Screen Shot2
editing in source view with completion proposal and browser preview.

Screen Shot3
editing in source view with tree view and a validation error message.