Virtual TI emulates nearly the entire line of Texas Instruments graphing calculators, and offers features that speed up both debugging and testing of calculator programs. Windows version is quite stable but the Linux/OSX version is only in planning.
Mandel is a command-line program for generating Mandelbrot set fractals - support for Julia sets is coming soon. Output is in the form of 8 bit greyscale Device Independent Bitmaps, which can be readily viewed with many common graphics programs.
Port of Numerical Python to Jython (Java Python) to support all mathematical operations (linear algebra, matrices, DSP, wavelets, FFT, arrays...) and thus compete with commercial packages such as Matlab. It can be easily embedded in Java programs.
CMATLIB is set of libraries for writing numerical applicatons. It
includes support for neural-networks, hidden Markov models, kd-trees,
and data smoothing. It may be used from C and Scheme programs.
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Develop finite element stress analysis programs, that work with free cad systems(Maybe QCad). Right now there's only a 2d gridded structure analysis prog with a crappy interface, written mainly in octave.
MATHOOL is an online and offline javascript application powered by REDUCE computer algebra system, JSXGraph and other open source javascript programs devoted to scientific calculations and graphic visualization.