Free Software


Histogram screenshotHistogram is a simple histogram creation tool.

  • Create histograms with up to 1000 data points
  • Choose from 1 to 100 bins and let Histogram calculate the appropriate bin width, or specify a bin width and Histogram will calculate the number of bins necessary.
  • Overlay Gaussian function on the histogram.
  • Export histogram to a Bitmap or JPEG image file.
  • Import/Export data from/to ASCII file.
  • Many new customization abilities added.


JagFit screenshotJagFit is a free plotting/fitting program that was designed for our teaching laboratories.

  • Linear Fits
  • Polynomial Fits.
  • Plots include error bars. (User input or estimated)
  • Fit parameters given with uncertainties. χ2also returned.
  • Save graph to a bitmap or JPEG image.
  • Export data table to ASCII file.
  • Enter up to 200 Data Points.
  • Add/Delete columns to the data table.
  • Select which columns to use for plotting and which to use for error bars.
  • Results of using the function utility can now be put in any column you choose.
  • Exponential and Power Law fits. 
  • Semi-Log and Log-Log plots.
  • Fit only a selection of rows in your data table. Useful for excluding a 'bad data point' from your fit.


MEchHeat screenshotMEchHeat is a tool for calculating the temperature of a thermistor based on resistance using the Steinhart-Hart equation.

  • Uses the temperature vs. resistance data furnished by PASCO scientific for use with the thermistor embedded in the aluminum cylinder of PASCO’s “Mechanical Equivalent of Heat” apparatus.
  • MEchHeat was developed for use with PASCO Scientific’s “Mechanical Equivalent of Heat” apparatus, but it can be used with any thermistor provided the user supplies the data file for calibration.

Plot Digitizer

Plot Digitizer screenshotPlot Digitizer is a useful program for extracting data from a linear, semi-log, or log-log plot. 

  • A zoom window aides you in clicking on precisely the point you are interested in.
  • Automatically corrects for the rotation of the image you're analyzing as well as the non-orthogonality of the axes.
  • Any 3 non-collinear points can be used for calibration. (Calibration points do not need to be on the axes.)
  • Save your progress at any time in a "project" file.
  • Label the calibration points you have selected. (Labels can be toggled on and off.)
  • Label the points you're digitizing on the calibrated image. (Labels can be toggled on and off.)
  • Export the calibrated image (showing the point labels) to a bmp or jpeg file.
  • Export data to an ASCII, an MS Excel or an MS Word file
  • Download "How Plot Digitizer Works" (PDF)

All of the software described on this page is completely free to download. It was developed by faculty in the Department of Physics at the University of South Alabama in Mobile, AL.