DataMelt is a program for numeric computation, mathematics, statistics, symbolic calculations, data analysis and data visualization. It supports several scripting languages, such as Python, Ruby, Groovy (and others), with the power of hundreds of Java packages. Available for Windows, Linux and Mac OS.
SCaVis is an environment for scientific computation, data analysis and data visualization designed for scientists, engineers and students. While itself implemented in Java, it provides bindings for Jython, Groovy, JRuby, BeanShell or Matlab/Octav for symbolic calculations. It features chart plotting, histograms, advanced statistics, symbolic calculations, data analysis, mathematical functions, data mining, linear algebra and plots.