All source code available here https://github.com/sqpsk/virtual-diagonal

Zplot

A simple and efficient interactive Java plotting library. Unfortunately there is no documentation, but here are some examples: RegularSeriesExample.java SquareAxisExample.java TimeAxisExample.java

SigGUI

A Java/C++ spectrum analyser application using Zplot. Plots timeseries and power spectra of uncompressed wave files.

SigGUI power spectrum screen shot