Kohsuke Kawaguchi has released args4j 2.0.2, an open source (MIT license) library for parsing command line arguments. Java 5 is required.
Gaudenz Alder has released JGraph 5.7.4.5, a free-as-in-speech (Mozilla Public License/LGPL) graph component for Swing that requires Java 1.4 or later. JGraph is accompanied by Graphpad, an open-source diagram editor for Swing that offers Automatic Layout, Printing, Zoom, and much more. It is available in English, German and French. 5.7.4.5 fixes bugs and improves performance.