JTreeMap releases 2 components:
* a Java Swing component JTreeMap and a demo app.
* a SWT/Eclipse Plugin component, KTreeMap
Furthermore, the JTreeMap library contains an applet that could be used out of the box as it can read data in from a file on the web site, see this example.
J. Kunkel, C. Schwenger, and J. Ziegler. Proceedings of the 28th ACM Conference on User Modeling, Adaptation and Personalization, page 126-135. ACM, (July 2020)