T-20 Predictor is a tool developed in WEKA to predict cricket scores and match results in T-20 matches based on parameters like venue and pitch type. It uses linear regression to predict scores in the first innings and decision trees to classify whether the batting team will win, lose or tie while chasing a target in the second innings. Data on past T-20 matches was collected from espncricinfo.com and cleaned before being used to build and test the predictive models.