Sage is a free open-source mathematics software system licensed under the GPL. It combines the power of many existing open-source packages into a common Python-based interface.
KidsNumbers.com is the absolutely free math resource designed by teachers, specifically for students and children of all ages. A place where students can practice all aspects of math, including addition, subtraction, multiplication, and division, in a fun and pressure free way.
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Algebrator - the leading Algebra software program available to, students, teachers, working professionals and educational institutions today.