QPlot: Allow you view or digitize scatter data.
Visualize scatter data starting from your NotePad; Support line point series and tabular column field data (read more for supported data format); Import export data through copy and paste; Online data coordinates tracking by mouse; Adjustable axis ratio preserved for more physical view.
It's light-weight, less than 1MB; 99% features are absolute free; the digitize part and matrix plot are restrict to 100 times trial, after that you can pay for $7.99 and keep it.