Tags: algebra, group theory, discrete mathematics, combinatorics.
Homepage: http://www.gap-system.org/
Tags: algebra, group theory, computer algebra system, analysis, number theory, cryptography, arithmetic, arbitrary precision, discrete mathematics, combinatorics.
Homepage: http://www.sagemath.org/
Tags: algebra, computer algebra system, discrete mathematics, combinatorics, group theory, representation theory.
Homepage: http://www.mathe2.uni-bayreuth.de/axel/symneu_engl.html