You can download yacas 1.3.6 from our software library for free. The actual developer of the free program is Under the GPL 2. The following versions: 1.2 and 1.0 are the most frequently downloaded ones by the program users. This download was scanned by our built-in antivirus and was rated as malware free. The program is included in Education Tools. The yacas installer is commonly called yacas.exe.
From the developer:
Yacas is an easy to use, general purpose computer algebra system, a program for symbolic manipulation of mathematical expressions. The system has a library of scripts that implement many of the symbolic algebra operations. New algorithms can be easily added to the library.
You may want to check out more software, such as Trachtenberg Speed Math, SatCalc or MathMatic, which might be related to yacas.