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GMP-ECM is a program to factor integers using the Elliptic Curve Method (ECM), based on the GNU MP multiprecision library.

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.

Gcalctool is a powerful graphical calulator with financial, logical and scientific modes. It uses a multiple precision package to do its arithmetic to give a high degree of accuracy.

The GNOME 2 spreadsheet.

Gnuplot is a portable multi-platform command-line driven graphing utility. It was originally created to allow scientists and students to visualize mathematical functions and data interactively, but has grown to support many non-interactive uses such as web scripting. It is also used as a plotting engine by third-party applications like Octave. Gnuplot has been supported and under active development since 1986. This port installs extra files for TeX terminals (latex, epslatex, Tikz, etc).

Gnuplot is a portable multi-platform command-line driven graphing utility. It was originally created to allow scientists and students to visualize mathematical functions and data interactively, but has grown to support many non-interactive uses such as web scripting. It is also used as a plotting engine by third-party applications like Octave. Gnuplot has been supported and under active development since 1986. Gnuplot supports many types of plots in either 2D or 3D. It can draw using lines, points, boxes, contours, vector fields, surfaces, and various associated text. It also supports various specialized plot types. Gnuplot supports many different types of output: interactive screen terminals (with mouse and hotkey input), direct output to pen plotters or modern printers, and output to many file formats (eps, emf, fig, jpeg, LaTeX, pdf, png, postscript, ...). Gnuplot is easily extensible to include new output modes. Recent additions include interactive terminals based on wxWidgets (usable on multiple platforms), and Qt. Mouseable plots embedded in web pages can be generated using the svg or HTML5 canvas terminal drivers.

Scriptable bar graph generator with stacked and clustered bars support, using gnuplot to produce fig output and then mangle it to fill in the bars. Any number of clustered datasets are supported, as well as automatic averaging and other features.

GotoBLAS2 is a fast implementation of Basic Linear Algebra Subprograms. It supports various architectures and is optimized for many cores, including Intel Nehalem and Atom, Via Nano, SiCortex, AMD Shanghai and Istanbul.

Grace is a WYSIWYG 2D plotting tool for the X Window System and M*tif, successor of ACE/gr (Xmgr). A few of its features are: * User defined scaling, tick marks, labels, symbols, line styles, colors. * Batch mode for unattended plotting. * Read and write parameters used during a session. * Polynomial regression, splines, running averages, DFT/FFT, cross/auto-correlation. * Exports high-resolution graphics to (E)PS, PDF, MIF, and SVG formats * Supports cross-platform PNM, JPEG and PNG formats While grace has a convenient point-and-click interface, most parameter settings and operations are available through a command line interface (found in Data/Commands).

The GraceTMPL classes provide an easy way to use existing grace-files as a template to format any number of graphs in a predefined way and save them as grace-files. This way you can apply the same graphical appearance to all of your data. In case your preferences change, you just alter the template and reformat your complete set of data within the shortest amount of time. The capabilities of GraceTMPL include: * The application using the GraceTMPL classes can define environment variables for the sheet, each graph and each dataset. The variables can be used in the template for dynamic string replacement. Even output filenames can be templated using variable substitution. * Datasets in the template file can be marked to be included in the destination files for easy reference. * Datasets can be tagged with arbitrary information strings to be interpreted by the application using GraceTMPL. This way information can be passed to the application on how to create the datasets and what kind of information is intended by the template author. * In case no template file is loaded by the application, GraceTMPL::Save will output plain sets of data tables which can easily be imported by XmGrace or other applications.