As many of you know, Slackware ships with a heap of software for the main distribution, but does not have a binary repository like some other distributions for additional. Hence, a volunteer organization: Slackbuilds.org (SBo), as well as others too numerous to mention.
For CAS and numerical calculations, covering a huge range of mathematics, including basic algebra, calculus, elementary to very advanced number theory, cryptography, numerical computation, commutative algebra, group...