Derive 5 computer algebra software is available as a free 30-day trial download from Chartwell-Yorke. Derive books are also here.

Compact, easy to use, reliable computer algebra software. It intelligently applies the rules of algebra, trigonometry, calculus and matrix algebra to solve a wide range of mathematical problems. This nonnumeric approach goes far beyond the capabilities of dedicated statistics packages and equation solvers that use only approximate numerical techniques.

By Terence Etchells and John Berry. Contents, supporting software; on-line ordering from Chartwell-Yorke.