JSystemMonitor is a free (LGPL) library for the Java(tm) platform. Its based on JFreeChart and Sigar. JSystemMonitor is still in alpha state, but already supports a lot of LineCharts, PieCharts and ThermometerCharts for System and JVM Monitoring.
UGL is Java to OpenGL adapter library: designed to be used in scientific applications; works on wide range of host systems: Windows, Linux, Solaris, AIX, IRIX, HP-UX and Mac OS X; supports Java from 1.1.8 to 1.6