JTransforms is the first, open source, multithreaded FFT library written in pure Java. Currently, four types of transforms are available: Discrete Fourier Transform (DFT), Discrete Cosine Transform (DCT), Discrete Sine Transform (DST) and Discrete Hartley Transform (DHT). The code is derived from General Purpose FFT Package written by Takuya Ooura and from Java FFTPack written by Baoshe Zhang.

Useful utility classes and signal processing tools for acoustic data analysis

mleap-core

Android Persistent SDK

Isotropic wavelets transform for 2D images. The plugin provides a multiscale representation of 2D images without directional bias.

Full Parallel Colt library for Icy. It also embed JTransforms, CSparseJ, Optimization, JPlasma, Netlib-java, Arpack-combo and JUnit libraries.

My own toolbox used for all the plugins I developed.

Dimple

for test purpose only