PyCM supports both input data vectors and direct matrix, and a proper tool for post-classification model evaluation that supports most classes and overall statistics parameters. PyCM is the swiss-army knife of confusion matrices, targeted mainly at data scientists that need a broad array of metrics for predictive models and accurate evaluation of a large variety of classifiers.

OpenJDK is a development environment for building applications, applets, and components using the Java programming language.

Symmetrica is a library for combinatorics. It has support for the representation theory of the symmetric group and related groups, combinatorics of tableaux, symmetric functions and polynomials, Schubert polynomials, and the representation theory of Hecke algebras of type A_n.

t4k_common is a library of code shared between tuxmath and tuxtype.

Taningia is a simple and modern communication library that provides tools to write software based on XMPP.