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Maxima is a Common Lisp implementation of MIT's Macsyma system for computer based algebra.

FFTW is a C subroutine library for computing the Discrete Fourier Transform (DFT) in one or more dimensions, of both real and complex data, and of arbitrary input size. We believe that FFTW, which is free software, should become the FFT library of choice for most applications. Our benchmarks, performed on a variety of platforms, show that FFTW's performance is typically superior to that of other publicly available FFT software. Moreover, FFTW's performance is portable: the program will perform well on most architectures without modification. The FFTW package was developed at MIT by Matteo Frigo and Steven G. Johnson. Please send email to fftw@theory.lcs.mit.edu so that we can keep track of users and send you information about new releases. The latest version of FFTW, benchmarks, links, and other information can be found at the FFTW home page.

FFTW is a C subroutine library for computing the Discrete Fourier Transform (DFT) in one or more dimensions, of both real and complex data, and of arbitrary input size. We believe that FFTW, which is free software, should become the FFT library of choice for most applications. Our benchmarks, performed on a variety of platforms, show that FFTW's performance is typically superior to that of other publicly available FFT software. Moreover, FFTW's performance is portable: the program will perform well on most architectures without modification. The FFTW package was developed at MIT by Matteo Frigo and Steven G. Johnson. Please send email to fftw@theory.lcs.mit.edu so that we can keep track of users and send you information about new releases. The latest version of FFTW, benchmarks, links, and other information can be found at the FFTW home page.

GOBLIN is a C++ class library focussed on graph optimization and network programming problems. It deals with all of the standard graph optimization problems discussed by textbooks and in courses on combinatorial optimization. Today, GOBLIN provides strongly polynomial algorithms for the following graph optimization problems: - Shortest paths in graphs and digraphs with negative lengths. - Negative cycles and minimum mean cycles. - Strong and 2-connected components. - Minimum spanning trees, arborescences and 1-trees. - Maximum st-flows, feasible circulations and b-flows. - Min-cost st-flows, b-flows and circulations. - Assignment problems of any kind. - 1-matchings, b-matchings, capacitated b-matchings, f-factors and degree-constrained subgraphs. - Directed and undirected Chinese postman problems, T-joins. The library also includes methods for NP-hard problems, namely TSP, ATSP, stable sets and graph colouring.

Fityk is a program for nonlinear fitting of analytical functions (especially peak-shaped) to data (usually experimental data). There are also people using it only to display data or to remove baseline from data. It is reported to be used in crystallography, chromatography, photoluminescence, infrared and Raman spectroscopy and other fields. Fityk knows about common peak-shaped functions (Gaussian, Lorentzian, Voigt, Pearson VII, bifurcated Gaussian, EMG, Doniach-Sunjic, etc.) and polynomials. It also supports user-defined functions. Fityk offers intuitive graphical interface (and also command line interface), variouse optimization methods (standard Marquardt least-square algorithm, Genetic Algorithms, Nelder-Mead simplex), equality constraints, modelling error of x coordinate of points (eg. zero-shift of instrument), handling series of datasets, automation of common tasks with scripts, and more.

GRPN is a RPN calculator for the X Window system built using the GIMP Toolkit (GTK). GRPN works with real numbers, complex numbers, matrices, and complex matrices. Numbers can be displayed in 4 different radix modes, and complex numbers can be displayed in either Cartesian or polar form.

FreeMat is a free environment for rapid engineering and scientific prototyping and data processing. It is similar to commercial systems such as MATLAB from Mathworks, and IDL from Research Systems, but is Open Source.

fxt is a library package (coming as C++ source code) containing various algorithms for: - Fast Fourier Transform (FFT) incl. real-vlued, - multidimensional and weighted variants. - Fast Hartley Transform (FHT) - Number Theoretic Transform (NTT), Fast Walsh Transform. - Convolution (cyclic, linear and weighted), - correlation and power spectrum. - Fast Haar Transform, Fast Wavelet Transform - Mass storage convolution and fast multiplication routines. - Sine- and cosine transform (DCT, DST), Fast Z-Transform (FZT)

Gambit is a library of game theory software and tools for the construction and analysis of finite extensive and normal form games. Gambit is designed to be portable across platforms. Gambit includes: - A graphical user interface, based upon the wxWindows library, providing a common look-and-feel across platforms. - The Gambit Command Language, a scripting language with built-in primitives for constructing and analyzing games. - A library of C++ source code for representing games, suitable for use in other applications.

gdcalc is a financial, statistics, scientific and programmers calculator for Unix. The GUI was written with glade(1) and uses the Gnome/Gtk+ toolkit - so it may well be compatible with themes and other whiz-bang features of those systems. gdcalc has both Algebraic notation (ie. conventional, TI or Casio style) and Reverse Polish Notation (RPN or Hewlett-Packard style). If you've not heard of RPN before, you are probably familiar with algebraic calculators. Very briefly, while simpler and more natural to use, RPN calculators need some study eg. they have an Enter key instead of the equals key.