Giac/Xcas is a free computer algebra system that supports Windows, Mac OS X, and Linux/Unix platforms.
One of the great things about Giac/Xcas is that it has a compatibility mode for apps like maple, mupad and the TI89. This means that if you're used to working with those tools, you can seamlessly switch over to using Giac/Xcas instead.
Another feature of Giac/Xcas is that it includes an interface that enables you to perform a wide range of mathematical operations. You can perform computer algebra, geometry (both 2D and 3D), and spreadsheet functions right within the software.
Under the hood, Giac/Xcas is powered by a free (GPL) C++ library called Giac. All of the computational heavy lifting is done by this library, and it can even be used inside other C++ programs if you need to integrate mathematical functions into your own software.
Overall, Giac/Xcas is a powerful and flexible tool for anyone who needs to do sophisticated mathematical work on their computer. It's free, functional across multiple operating systems, and offers a wide range of features to help you get your work done.
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