Rattle is a freely available open source windows GUI for the some packages of the R programing language. Rattle neatly integrates these packages into a seamless tool for data mining, analytics, and statistical activities.

Rattle is a tab based program, where each tab is interconnected, some of the functions and tabs are;

• File Inputs = CSV, TXT, Excel, ARFF, ODBC, R Dataset, RData File, Library Packages Datasets, Corpus, and Scripts.
• Statistics = Min, Max, Quartiles, Mean, St Dev, Missing, Medium, Sum, Variance, Skewness, Kurtosis, chi square.
• Statistical tests = Correlation, Wilcoxon-Smirnov, Wilcoxon Rank Sum, T-Test, F-Test, and Wilcoxon Signed Rank.
• Clustering = KMeans, Clara, Hierarchical, and BiCluster.
• Modeling = Decision Trees, Random Forests, ADA Boost, Support Vector Machine, Logistic Regression, and Neural Net.
• Evaluation = Confusion Matrix, Risk Charts, Cost Curve, Hand, Lift, ROC, Precision, Sensitivity.
• Charts = Box Plot, Histogram, Correlations, Dendrograms, Cumulative, Principle Components, Benford, Bar Plot, Dot Pot,and Mosaic.
• Transformations = Rescale (Recenter, Scale 0-1, Median/MAD, Natural  Log, and Matrix) - Impute ( Zero/Missing, Mean, Medium, Mode &  Constant), Recode (Binning, Kmeans, Equal Widths, Indicator, Join  Categories) - Cleanup (Delete Ignored, Delete Selected, Delete Missing,  Delete Obs with Missing)

Rattle also uses two external graphical investigation / plotting tools. Latticist and GGobi are independent applications which provide highly dynamic and interactive graphic data visualisation for  exploratory data analysis.

Further information can be gained at;

http://togaware.com

http://en.wikipedia.org/wiki/Rattle_GUI