(WX)Maxima is a free open-source computer-algebra software, and is the basis for commercial softwares such as Waterloo Maple and Wolfram Mathematica. Being free and open-source means that unlike commercial alternatives, Maxima computations can be easily shared and modified for free with the widest audience possible on a variety of platforms. Maxima instructions can even be written in plaintext without any special software, with a Maxima client only needed to view the computed results.


[image: WXMaxima screenshot]
Wikimedia WXMaxima screenshot.