Mondrian is a general-purpose statistical data-visualization system, for interactive data visualization.
Mondrian links to R and offers statistical procedures like interactive density estimation, scatterplot smoothers, multidimensional scaling (MDS) and principal component analysis (PCA).
Over the years, a complete suite of visualizations for univariate and multivariate data measured on any scale were added.
The link to R offers well tested statistical procedures, which integrate seamlessly into the interactive graphics.
Last stable and beta versions, help and documentations are available on the developer web site, Martin Theus Mondrian works on plain text files with tab-separated columns with variable header, as exported from Microsoft Excel as ".txt".