Dataplot 3.1 could be downloaded from the developer's website when we last checked. We cannot confirm if there is a free download of this software available. The actual developer of the free software is CBIM.
The most frequent installer filenames for the software include: DataPlot.exe and DataPlot3.exe etc. We recommend checking the downloaded files with any free antivirus. The most popular versions among Dataplot users are 3.1, 2.3 and 1.1. The software belongs to Education Tools. This PC software can be installed on 32-bit versions of Windows XP/Vista/7/8/10/11.
From the developer:
DataPlot is a program where you can import your time based data and graph it. You can move easily back and forward in user defined time window, allows individual time setting for each graph, values read directly in graph by dragging mouse over the curve and much more
You may want to check out more software, such as Wintree, PolicyMaker or FSAcars, which might be similar to Dataplot.