Kst is a data plotting and analysis program; it's the fastest real-time large-dataset viewing and plotting tools for examining data streams which can plot x-y plots, power spectra, histograms and equations (including equations of data streams). It can also be used to examine data in files which are being updated as data is being logged, in which case it can act as a plotter for a chart recorder. kst also contains a command line interface for rapid analysis of large amounts of data, many powerful built-in features and it's expandable with plugins and extensions. Some features are;

Kst is a KDE application and is freely available for anyone to download and use. For more informations click here

           

LabPlot is an open source application for data plotting, function analysis, data analysis and visualisation written for KDE. It supports both 2D and 3D plots and tries to emulate most of the functions supported by programs like Microcal Origin (it's able to import Origin's data file) and SPSS Sigmaplot; flexible data reading/writing in different formats (cdf, netcdf, audio, binary, images and so on), reading of images (over 80 image formats), support for all GNU Scientific Library (GSL, a collection of routines for numerical computing. The routines are written from scratch by the GSL team in ANSI C, and present a modern API for C programmers, while allowing wrappers to be written for very high-level languages) functions and constants. Some features;

• double click in plot to open detailed dialogs for all settings;
• every object can be dragged by mouse;
• average, smooth and prune data, compress, periodical and seasonal analysis, peak find, interpolation (splines, etc.), differences,  integration, fourier transform, (de)convolution and so on!
• support for different worksheets and spreadsheets using MDI;
• save and open all worksheets and spreadsheet in a project file (*.lpl);
• export worksheets as image, ps, svg, eps, pdf and many more formats (using pstoedit or ImageMagick);
• ...and many other!

For more information click here.

            

The Smith chart, invented by Phillip H. Smith (1905-1987), is a graphical aid or nomogram designed for electrical and electronics engineers specializing in radio frequency (RF) engineering to assist in solving problems with transmission lines and matching circuits. The Smith Chart is a graphical reflection coefficient system with normalized conformal mapping of impedance or admittance coordinates. A Smith Chart is still a very useful graphics method for getting a quick grasp of the effects of system design parameters on constant or varying frequency: it's a tool used in electrical/electronic engineering that shows how the complex impedance of a transmission line varies along its length, and simplifies the design of impedance matching networks to match the line to its load. You can enter either discrete components or transmission lines, see the results on screen and/or generate Postscript output. Component values can be changed numerically or using scrollbars. LinSmith is a Smith Charting program, mainly designed for educational use. As such, there is an emphasis on capabilities that improve the "showing the effect of" style of operation. Its main features are:

For more information about Linsmith, click here.