Scilab

Scilab is an open source MATLAB-like programming language for numerical analysis.Mora, Á., Galán, J. L., Aguilera, G., Fernández, Á., Mérida, E., & Rodríguez, P. (2010). Scilab and Maxima Environment: Towards Free Software in Numerical Analysis. International Journal for Technology in Mathematics Education, 17(2).Bunks, C., Chancelier, J. P., Delebecque, F., Goursat, M., Nikoukhah, R., & Steer, S. (2012). Engineering and scientific computing with Scilab. Springer Science & Business Media. 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, --> , in the graphical command window.

Hello World! in Scilab:
disp('Hello World');
 Toolboxes 
Scilab has many toolboxes for different tasks, such as
 Scilab Image Processing Toolbox (SIP) and its variants (such as SIVP). This is used for image processing.Fabbri, R., Bruno, O. M., & Costa, L. D. F. (2012). Scilab and SIP for image processing. arXiv preprint arXiv:1203.4009.Thanki, R. M., & Kothari, A. M. (2019). Digital image processing using SCILAB. Springer International Publishing.
 Scilab Wavelet Toolbox: Used for wavelets
 Scilab Java and .NET Module
 Scilab Remote Access Module

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 equationsWouwer, A. V., Saucez, P., & Vilas, C. (2014). Simulation of Ode/Pde Models with MATLAB®, OCTAVE and SCILAB: Scientific and Engineering Applications. Springer.). Today, it is also used in scientific educationSharma, N., & Gobbert, M. K. (2010). A comparative evaluation of Matlab, Octave, FreeMat, and Scilab for research and teaching. UMBC Faculty Collection.Campos, D., Dias, N., Dias, A., & Ferreira, H. (2010). INTRODUCING NUMERICAL ANALYSIS TOOLS IN ENGINEERING. A SCILAB USER CASE IN ELECTRONICS COURSE. Proceedings of ICERI, 5178-5184.Kouroussis, G., Fekih, L. B., Conti, C., & Verlinden, O. (2012, July). EasyMod: A MatLab/SciLab toolbox for teaching modal analysis. In Proceedings of the international congress on sound and vibration, Vilnius (pp. 9-12).Liao, W., Dong, N., & Fan, T. (2009, September). Application of Scilab in teaching of engineering numerical computations. In 2009 IEEE International Workshop on Open-source Software for Scientific Computation (OSSC) (pp. 88-90). IEEE. and optimization.Baudin, M., Couvert, V., & Steer, S. (2010). Optimization in scilab. Scilab Consortium, INRIA Paris-Rocquencourt.Baudin, M., & Steer, S. (2009, September). Optimization with scilab, present and future. In 2009 IEEE International Workshop on Open-source Software for Scientific Computation (OSSC) (pp. 99-106). IEEE.
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