There was a download of VIGraph 1.5 on the developer's website when we last checked. We cannot confirm if there is a free download of this software available. This program is an intellectual property of Valeri Vlassov. We recommend checking the downloaded files with any free antivirus. The default filename for the program's installer is VIGraph.exe. The software lies within Education Tools, more precisely Science Tools. The following versions: 1.5, 1.4 and 1.0 are the most frequently downloaded ones by the program users.
From the developer:
VIGraph is a simple tool for drawing diagrams from your TXT or CSV data files. The program scales your diagrams automatically or manually, shows real-time changes in your data files, shows the spectrum for any column of your data files (Fast Fourier Transform), allows you to open as many data files simultaneously as you need, and more.
You may want to check out more software, such as StatPlus 2007, Avantage BPM Foundation or Adding Machine, which might be similar to VIGraph.