EasyGrapher is a graphical display and statistical validation program designed for the decision support system for agro-technology transfer (DSSAT) suite of models. EasyGrapher can expedite validation of DSSAT output, which normally requires considerable time and effort to export output data into external statistical packages. It allows users to create validation graphs, displaying simulated data against ground-truth data and calculate validation statistics such as root mean square error, mean error, forecasting efficiency and paired t-tests. It operates under Microsoft Windows, is free of charge, and is available as part of a distribution toolkit with DSSAT v4.0.