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Originally an extension to Axiom, now a separate product. Binaries are available free for non-profit use, with documentation, tips, projects and links.

Helps students with equations and inequalities, simplifying expression, graphing and complex numbers. Includes problem solving exercises.

Personal Algebra Tutor - Enter your algebra problems and get instant step-by-step solutions with explanations.

A special-purpose system for computations in Commutative Algebra.

Computer algebra system for computation in commutative and non-commutative rings and modules. Win32, Unix.

An open framework for symbolic computation within the C++ programming language. The name GiNaC is an iterated and recursive abbreviation for "GiNaC is Not a CAS", where CAS stands for Computer Algebra System. Its design is revolutionary in a sense that contrary to other CAS it does not try to provide extensive algebraic capabilities and a simple programming language but instead accepts a given language (C++) and extends it by a set of algebraic capabilities. It is published under the GNU Public License (GPL).

An experimental computer algebra system written in Java and available free under GPL.

Mathscribe is free dynamic graphing and modeling software for use in algebra classes. Lesson plans for linears and quadratics are included.

C++ matrix class library which promotes the notational convenience of linear algebraic codes. Free download.

A GPL CAS based on DOE-MACSYMA. A GPL project.