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The Unidata units library, udunits, supports conversion of unit specifications between formatted and binary forms, arithmetic manipulation of unit specifications, and conversion of values between compatible scales of measurement.

V_Sim visualizes atomic structures such as crystals, grain boundaries and so on (either in .d3 format as defined by F. Lan�on, or in plain text format as described in the sample page). The rendering is done in pseudo-3D with colored sphere to represent the atoms. The user can interact through many functions to choose the view, the size of the atoms, their color, the background color, the type of fog... Much of it is detailled in the user guide. Moreover V_Sim allows to export the view as image in GIF, PS or more formats.

Veusz is a GUI scientific plotting and graphing package. It is designed to produce publication-ready Postscript or PDF output. SVG, EMF and bitmap formats export are also supported. The program runs under Unix/Linux, Windows or Mac OS X, and binaries are provided. Data can be read from text, CSV or FITS files, and data can be manipulated or examined from within the application.

VMD is a molecular visualization program for displaying, animating, and analyzing large biomolecular systems using 3-D graphics and built-in scripting.

Voro++ is a software library for carrying out three-dimensional computations of the Voronoi tessellation. A distinguishing feature of the Voro++ library is that it carries out cell-based calculations, computing the Voronoi cell for each particle individually. It is particularly well-suited for applications that rely on cell-based statistics, where features of Voronoi cells (eg. volume, centroid, number of faces) can be used to analyze a system of particles.

XMakemol is a program written for UN*X operating systems in ANSI C using the X, Xt and Motif libraries. It can be used to view and manipulate atomic and molecular data given in xyz format. XMakemol is a mouse-based application and many features can be accessed by clicking or dragging the mouse on the main window. Additional popup dialogs offer a number of additional features. Here is what an XMakemol session might look like. The system is a bucky ball and the Measure dialog is showing the measurement of bond-lengths, angles and a torsion angle. XMakemol can produce output in PostScript (black and white or colour)and in xpm format (which can be translated to gif format using xpmtoppm and ppmtogif). XMakemol can also produce a series of xpm files which can be translated into an animated gif file using the bundled utility xmake_anim.pl (formerly gmake_anim.pl). The one above is an animation of the "viagra" molecule (sidenafil).

A suite of tools for visualising sequence alignments. Blixem is an interactive browser of pairwise alignments that have been stacked up in a "master-slave" multiple alignment; it is not a 'true' multiple alignment but a 'one-to-many' alignment. Belvu is a multiple sequence alignment viewer and phylogenetic tool. It has an extensive set of user-configurable modes to color residues by conservation or by residue type, and some basic alignment editing capabilities. Dotter is a graphical dot-matrix program for detailed comparison of two sequences. Every residue in one sequence is compared to every residue in the other, with one sequence plotted on the x-axis and the other on the y-axis.

The GNU hello program produces a familiar, friendly greeting. It allows nonprogrammers to use a classic computer science tool which would otherwise be unavailable to them.

Geek Clock is a plasma applet for KDE4 that displays an analog clock. Instead of regular numerals, it display equivalent notations based on mathematics, physics, and computer science.

PyFITS provides an interface to FITS formatted files under the Python scripting language. It is useful for interactive data analysis and for writing analysis scripts in Python using FITS files as either input or output. PyFITS is a development project of the Science Software Branch at the Space Telescope Science Institute.