The mathapps package contains a number of simple data source Physlets.
Since they are designed to deliver data to other Physlets, they have a very
minimal user interface.
The FFT routine used in the mathapps.FFT applet uses the jnt.fft package
that was developed by Bruce Miller at
NIST. Several routines in this subpackage are
Java ports of routines derived from Brian Gough's FFT routines in the Gnu
Scientific Library (GSL). GSL is released under the Gnu
General Public License; As such, this package must also be released under
The Physlet code for the
mathapps.FFT applet may be downloaded here. This code is also being
released under he Gnu General