Computer Algebra Links
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SymbolicNet (Symbolic Mathematical Computation Information Center)
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Combinatorial Software and Databases
(Séminaire Lotharingien de Combinatoire)
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Mathematica (Wolfram Research).
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Maple (Waterloo Maple)
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Reduce
(an interactive program designed for general algebraic computations of
interest to mathematicians, scientists and engineers)
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Matlab (integrates mathematical computing, visualization, and a
powerful language to provide a flexible environment for technical computing)
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Octave (GNU Octave is a high-level language, primarily intended for
numerical computations. It is mostly compatible with Matlab.)
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Sage
(a free open-source  mathematics software system)
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Mathemagix
(a free computer algebra system under development)
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GAP
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Magma
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Macaulay2
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SINGULAR
(for polynomial computations)
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ACE (Algebraic Combinatorics Environment)
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LiE (Lie theory computations)
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Home Page for SF (Symmetric Functions), posets, and coxeter/weyl
(John Stembridge's Maple packages)
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MOPS, Multivariate orthogonal polynomials (symbolically)
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Felix
(for computation in commutative and non-commutative rings and modules)
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computer algebra and special functions (Tom Koornwinder)
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Schubert,
a Maple package for intersection theory and enumerative geometry
(Sheldon Katz, Stein Arild Strømme, Jan-Magnus Økland)
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FeynCalc, Tools and Tables for Quantum Field Theory Calculations
(in Mathematica).
- 
Hyperdire,
a set of Mathematica based programs for differential reduction
of Horn type hypergeometrical functions.
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AXIOM
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NCAlgebra (non-commutative algebra package in Mathematica)
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CLIFFORD (a Maple package for Clifford algebra computations)
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FORM (program for large scale symbolic manipulation)
by Jos Vermaseren.
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RATE - A Mathematica guessing machine
(by Christian Krattenthaler:
to guess a closed form expression for a sequence of numbers
or rational functions
- 
Algolib:
combinatorics package for Maple by Bruno Salvy and coworkers (INRIA, France)
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Haskell
(a purely functional programming language)
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GrInvIn,
an interactive software application for studying graphs and their invariants
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pages on fast algorithms by Ekatherina Karatsuba:
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Documentation on the Gröbner Package for Gap 4
by  A.M. Cohen and D.A.H. Gijsbers (TU Eindhoven)
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Perfectly Scientific, Inc. (PSI), an algorithm company.
 They offer
PrimeKit: Mathematica implementations for the algorithms in the book
R. Crandall and C. Pomerance,
Prime numbers.
- 
Schoonschip was instrumental in the research by Martinis Veltman leading to
his 
Nobel Prize in Physics 1999.
to Tom Koornwinder's home page