With yoshinoGraph you can make 3D and 2D graphs quickly from data files in text format. 

This software is tiny but includes many basic functions to analyze/edit data as well as rather advanced ones.

Here are some key features of "yoshinoGraph":

· plot styles: scatter charts, density and 3D (under development) plots with and without lines
· double Y-axis and shift in Y direction are available in 2D graph
· easy to change scales among linear, log and inverse
· polynomial fit
· manual fit of two independent lines to a data curve
· easy to remove scattered/noisy data
· easy to convert data; quick sort, smoothing, making tables and so on
· to draw a math function on 2D graph using an expression
· to copy a graph as metafile and bitmap formats to paste it on a presentation software
· easy to read many data files saved in different folders