Scilab

Scilab is an open source MATLAB-like programming language for numerical analysis. It is used in many countries including non-English regions.
Syntax.
Scilab syntax is largely based on the MATLAB language. The simplest way to use Scilab codes is to type it in at the prompt, codice_1, in the graphical command window.
Hello World! in Scilab:
disp('Hello World');
Toolboxes.
Scilab has many toolboxes for different tasks, such as
More are available on ATOMS Portal or the Scilab forge.
Differences between GNU Octave.
GNU Octave is also a MATLAB-like language. But it was made by different technical viewpoints.
Usage.
The original purpose of Scilab was numerical analysis (such as numerical methods for ordinary differential equations). Today, it is also used in scientific education and optimization.