Editorok JAVA-hoz, XML-hez (a teljesség igénye nélkül...)

Oracle JDeveloper (Windows, Linux):
http://www.oracle.com/technetwork/developer-tools/jdev/overview/index.html

jEdit (Windows, Linux, Mac OS X):
http://www.jedit.org

NetBeans IDE (Windows, Linux, Mac OS X, Solaris):
http://netbeans.org

IntelliJ IDEA (Windows, Linux, Mac OS X):
http://www.jetbrains.com/idea