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Free version of the powerful Systat statistics program designed for educational establishments, school students and students. Provides all the basic calculation and analysis functions of the main program, such as random selections, correlation calculations, hypothesis tests, simple factors and cluster analyses. Includes PDF of operating instructions. Download requires registration.

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Uses the Mathematica mathematics program to test your PC’s performance. The testable functions are combined to form higher mathematical categories. Runs functions several times in a row to achieve reliable results.

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Depicts the planets in our solar system as well as some moons in 3D and shows important information about each object.

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Program to transform a Java-enabled phone into a function plotter and calculator, with formula memory for up to 20 functions. The phone can calculate derivatives as formulas and map up to two derivatives. It can also display up to three functions simultaneously and add them together graphically.

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E-book for students dealing with mathematics. Provides information on topics such as differential and integral calculus, complex numbers and trigonometric functions. Further e-books available.

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64-bit decimal/binary/hexadecimal converter for Windows computers that executes logical operations bit by bit. Manufacturer's web site currently unavailable.

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DXF 3D viewer which displays and prints DXF files (versions 12, 12 and 14) and exports as a PDF PostScript, SVG, JPG, PNG, Tiff, GIF or BMP file.

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Use this tool to analyse and interpret texts for the purposes of social scientific research. It provides useful support when you’re developing and testing theoretical inferences. Download requires a valid email address.

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Menstruation calendar for monitoring your cycle. Not only displays how long your period lasts but also the ovulation date and the days on which you are fertile. Can also create personal statistics, for example, for your next visit to the gynaecologist.

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Prints any file on each printer configured on the system or on the network, directly from the Windows Explorer menu or in the integrated browser menu. Includes extended functions for HP DesignJets and printers with PostScript RIPs; extended Plus Version, which is also free, is available.

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Star map tool that displays the position of the stars at a freely definable time and from any location on Earth. You can also scale, rotate and print out the constellations. Includes a range of setting options. Also available for Pocket PCs.

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Virtual planetarium for KDE environments; displays the sky at night with, among other things, 130,000 stars, all eight planets of our solar system, the sun and the moon, and also many comets and asteroids. Fast and secure download from The H

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Converts PDF files to AutoCAD DWG and DXF files. Multiple files can be converted simultaneously. Also available as an add-in for AutoCAD versions 2007, 2006, 2004, 2002 and R14.

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Layout software for creating electronic printed circuit boards, during which you can add components directly from a components manager or move them with the mouse.

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Sound generator for testing or tuning purposes. Generates fixed and increasing frequencies with sine, square and triangle functions. Stores up to four presets.

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Creates an animated 3D display of worldwide earthquakes that have occurred during the last seven days. Includes extra information and a zoom function for certain regions. Information is obtained via the internet from the National Earthquake Information Center of the U.S. Geological Survey.

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Java application based on a NASA project that simulates recordings from three different microscopes (electron, fluorescence and atomic force microscope); currently over 62 GB of photographic material, in over 90 templates, are available for free download.

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This tool gives you independent control over the frequencies, phases and volumes of the left-and right-hand audio channels. Includes options for storing the measured data points for statistical analysis.

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Program for visualising electric fields and equipotential lines which can also display field strength and potential.

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Use this to convert DWG, DXF and DWF files into PDF, either singly or in batch mode, without the need for AutoCAD. Extended Pro version available for $186, ActiveX Control version for $498.

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