R is a language and environment for statistical computing and graphics. - Read more

KStars is a Desktop Planetarium for KDE. It provides an accurate graphical simulation of the night sky, from any location on Earth, at anydate and time. The display includes 40,000 stars, 13,000 deep-sky objects,all 8 planets, the Sun and Moon, and thousa - Read more

Celestia is a real-time space simulation that lets you experience our universe in three dimensions. Unlike most planetarium software, Celestia doesn't confine you to the surface of the Earth. You can travel throughout the solar system, to any of over 100, - Read more

Ghemical is a molecular modelling software package with GUIs for both GLUT and GTK+, and some nice 3D-visualization tools. It can do all-atoms molecular mechanics and dynamics, athough the current parameter set is still experimental. It can also be used a - Read more

Scilab is a scientific software package for numerical computations providing a powerful open computing environment for engineering and scientific applications. - Read more

gnuplot plots 2d and 3d graphs, from a data file or with a formula. It has an interactive mode with online help, or it can be used non-interactively. gnuplot does function fitting to data sets, and it does output to many terminals, among which are PostScr - Read more

GMT is an open source collection of ~60 tools for manipulating geographic and Cartesian data sets (including filtering, trend fitting, gridding, projecting, etc.) and producing Encapsulated PostScript File (EPS) illustrations ranging from simple x-y plots - Read more

ORSA is an interactive tool for scientific grade Celestial Mechanics computations. Asteroids, comets, Solar, and extra-Solar planetary systems can be accurately reproduced, simulated, and analyzed. - Read more

Jmol is a Free, Open Source molecule viewer and editor. It is a measurement tool for chemical scientists. - Read more

DrScheme is a graphical environment for developing programs using the Scheme, MzScheme, and MrEd programming languages. - Read more

This is excelent statistical analysys tool. By excelent I mean: profesors and doctors in econometric use it to do science. - Read more

Stellarium is a free software available for Windows, Linux/Unix and MacOSX. It renders 3D photo-realistic skies in real time. With stellarium, you really see what you can see with your eyes, binoculars or a small telescope. - Read more

Thuban is an Interactive Geographic Data Viewer. - Read more

PLOTICUS is a command line utility for creating bar, line, pie, boxplot and other types of charts and plots. - Read more

Nightfall can produce animated views of eclipsing binary stars, calculate synthetic lightcurves and radial velocity curves, and eventually determine the best-fit model for a given set of observational data of an eclipsing binary star system. - Read more

Xplanet renders an image of the earth into the X root window. All of the major planets and most satellites can be drawn, similar to the Solar System Simulator. Objects are time tracked. A number of different map projections are also supported, including a - Read more

KSEG is a program for exploring Euclidean geometry, similar to Geometer's Sketchpad. It features points, lines, transformations, measurements, calculations, simple editable recursive Constructions (similar to macros), adaptively sampled loci, and selectio - Read more

A fully developed set of DNA sequence assembly (Gap4), editing and analysis tools (Spin) for Unix, Linux, MacOSX and MS Windows. - Read more

This program enables you to draw sky charts, making use of the data in 16 catalogs of stars and nebulae. In addition the position of planets, asteroids and comets are shown. - Read more

The Chemistry Development Kit (CDK) classes are Java utitility classes for chemoinformatics and computational chemistry. They are a complete re-write of the CompChem classes that were the basis of JChemPaint, a Java Editor for 2D chemical structures, and - Read more