Baudline (Copyright (c) 2007 by SigBlips) is a time-frequency browser designed for scientific visualization of the spectral domain. Signal analysis is performed by Fourier, correlation, and raster transforms that create colorful spectrograms with vibrant detail. Conduct test and measurement experiments with the built in function generator, or play back audio files with a multitude of effects and filters. The baudline signal analyzer combines fast digital signal processing, versatile high speed displays, and continuous capture tools for hunting down and studying elusive signal characteristics. Some features are;

Notice; this software is Free To Use But Restricted. Please, for the users, read carefully terms of license.

           

DSO101 (Digital Storage Oscilloscope), WGM101 (Waveform Generator) and CGR101 (Circuit Gear) are software for instruments Syscomp Electronic. The DSO-101 is an USB-powered digital storage oscilloscope with dual 20MS/s inputs and a 2MHz bandwidth; it packs some powerful features including a hardware preamp, adjustable digital triggering, and 32kB memory depth on each of the two 8 bit input channels. The DSO-101 is powered by an open-source graphical user interface for GNU/Linux. The fully functional, easy to use software supports multiple triggering modes, waveform scrolling, saving waveforms to a file, and cursor measurements. Source code is included. The user can add and modify the graphic user interface as desired. The WGM-101 is an USB-powered waveform generator. This device generates all standard test waveforms (Sine, Square, Triangle, Sawtooth) as well as arbitrary waveforms created by the user. Precise digital frequency control allows adjustment of the output frequency from 0.1Hz to 100kHz with a resolution of 0.1Hz. The open source graphical user interface (WGM101) allows the user to download custom waveforms into the device for non-volatile storage, sweep the frequency over a particular frequency range with a point-and-click interface, and directly control the output amplitude and offset. Circuit Gear is an oscilloscope, waveform generator, and digital I/O port integrated into one small, low cost unit. Here is some features;

The current releases of software provide basic features for the instruments, but there are many that could be added. For example, the oscilloscope would benefit from 'waveform math' commands. The waveform generator could be configured as an audio sweep generator and so on.

           

Fityk is a program for nonlinear fitting of analytical functions (especially peak-shaped) and data analysis software (usually experimental data). There are also people using it to remove the baseline from data, or to display data only. It supports data visualization, separation of overlapping peaks, and least squares fitting using standard Levenberg-Marquardt algorithm, a genetic algorithm, or Nelder-Mead simplex method. It knows common bell-shaped functions (Gaussian, Lorentzian, Pearson 7, Voigt, Pseudo-Voigt) and polynomials, but more sophisticated formulae can be added if needed. It also enables background substracting, data calibration and task automation with a simple script language. It is being developed to analyze powder diffraction patterns, but can be used to fit analytical functions to any kind of data, e.g. it's reportedly used in crystallography, chromatography, photoluminescence and photoelectron spectroscopy, infrared and Raman spectroscopy, and more. Fityk offers intuitive graphical interface (and also command line interface), variouse optimization methods (standard Marquardt least-square algorithm, Genetic Algorithms, Nelder-Mead simplex), equality constraints, modelling error of x coordinate of points (eg. zero-shift of instrument), handling series of datasets, automation of common tasks with scripts, and more. For more information click here. Terms of license are GNU GPL.

           

GerbV (GerberViewer) is a viewer for Gerber files; these files are generated from PCB CAD system and sent to PCB manufacturers as basis for the manufacturing process. The different layers of the PCB are separated into different files. Gerbv is a program which can display, edit, export, and do other manipulation of file formats used in PCB design (RS274X, Excellon drill, and pick-and-place). The core library (libgerbv) is available as a separate library, allowing other software to easily incorporate advanced Gerber functionality. It's one of the utilities affiliated with the gEDA project, an umbrella organization dedicated to producing free software tools for electronic design. There are two standards defining Gerber files: an old one called RS-274D, and a newer one called RS-274X. GerbV supports the following features:

Gerbv is also included in the Fedora Electronic Lab live distribution. Another Gerber software is associated to the suite KiCAD. Note: GerbV displays RS-274X files, but will not display RS-274D files!