JStandAloneComponents

Members:

3

Library of stand-alone Java components ie unlike swingx et al no dependencies between different components and each component can be compiled into separate jars if required.

MigLayout - For Swing, SWT and JavaFX

Members:

2

For Java developers writing GUI layouts by hand that wants simplicity, power and automatic per platform fidelity, that are dissatisfied with the current layout managers in Swing and SWT, MiGLayout solves your layout problems. User interfaces created with MiGLayout is easy to maintain, you will understand how the layout will look like just by looking at the source code.