GNU PSPP is a program for statistical analysis of sampled data. It is a Free replacement for the proprietary program SPSS, and appears very similar to it with a few exceptions.
RKWard is an IDE/GUI for the R programming language, which adds powerful statistics tools. It provides a spreadsheet-like data editor, syntax highlighting, code folding and completion, CSV/SPSS import, plotting previews, a history browser, R package management, workspaces, dialogs and wizards for plots and statistics.
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.
Practically Random is a test suite for PRNGs. It provides multithreaded statistical probing of the actual randomness of RNGs. It also includes multiple well-designed pseudo-random number generators and interfaces.
Savors can visualize multiple data streams from arbitrary input pipes. It synchronizes them in accordance to elapsed time, and arrange sources and their visualizations in any layout.
Armadillo is a C++ linear algebra library (matrix maths) aiming towards a good balance between speed and ease of use. The API is deliberately similar to Matlab. Provides efficient classes for vectors, matrices and cubes, as well as many functions which operate on the classes (eg. contiguous and non-contiguous submatrix views). Integer, floating point, and complex numbers are supported, as well as a subset of trigonometric and statistics functions. Various matrix decompositions are provided