JACAL is an interactive symbolic mathematics program. Find JACAL at: http://www-swiss.ai.mit.edu/~jaffer/JACAL.html
The Matrix Template Library (MTL) is a high-performance generic component library that provides comprehensive linear algebra functionality for a wide variety of matrix formats. Find The Matrix Template Library at: http://www.osl.iu.edu/research/mtl/
An incredibly useful set of libraries for numerical computation. Find Netlib at: http://www.netlib.org
S Routines for Social Network Analysis the R Statistical Computing Environment Find SNA Package at: http://erzuli.ss.uci.edu/R.stuff/
A free online textbook on abstract algebra with emphasis on linear algebra. Find Edwin H. Connell: Elements of Abstract and Linear Algebra at: http://www.math.miami.edu/~ec/book/
Goose is a LGPLed C++ library dedicated to statistical computation. Find Goose at: http://www.gnu.org/software/goose/
PARI-GP is a software package for computer-aided number theory. Find PARI-GP at: http://www.parigp-home.de/
