Altair Compose is described as 'is used to perform a variety of math & linear algebra (including matrix analysis and differential equations), filter signals, fit polynomials through data, approximate or check results from simulation software, perform optimization' and is an app in the Development category. There are six alternatives to Altair Compose for a variety of platforms, including Windows, Linux, Mac, Online / Web-based and Android. The best alternative is GNU Octave, which is both free and Open Source. Other great apps like Altair Compose are MATLAB (Paid), Mathematica (Paid), Scilab (Free, Open Source) and Julia (Free, Open Source).
Octave is a computer program for performing numerical computations which is mostly compatible with MATLAB. It is part of the GNU Project. It is free software under the terms of the GNU General Public License.
MATLAB is a numerical computing environment and programming language. Maintained by The MathWorks, MATLAB allows easy matrix manipulation, plotting of functions and data, implementation of algorithms, creation of user interfaces, and interfacing with programs in other languages.