R. Rawson-Tetley has posted SwingWT 0.85,
an open source, "100% pure Java library which very closely resembles the interface of Swing. The difference is that instead of using the Swing library, it drives native peer widgets from SWT" (the Eclipse GUI toolkit).
With this library, Java/Swing applications can be compiled natively under Linux using gcj. It also allows Swing apps to use native widgets.
This release adds support for SWT 3.0.1, StyledDocument/JEditorPane, pluggable editor panes,
and a classloader that swaps Swing for SwingWT on the fly (neat hack!).
SwingWT is dual licensed under the Common Public License
and the LGPL.