From Harukazu YOSHINO :
yoshinoGRAPH is a scientific graph software for data analysis and presentation. You can make 2D and 3D graphs quickly from data files in text format. This software is tiny but includes many basic functions to analyze or edit data as well as rather advanced ones. Followings are some features of yoshinoGRAPH: plot styles: scatter charts, density and 3D plots with options, a lot of color, symbol and other style options, double y-axis and shift in y direction are available in 2D graph, easy to read many data files saved in different folders, easy to change scales among linear, log and inverse, and easy to convert data using many mathematical functions.