GNU Octave is a programming language with an integrated development environment (IDE) full of tools to model and simulate a variety of natural and artificial systems that have applications in engineering and science. Octave is cross-platform software with Windows, Linux, Mac, and BSD versions available. Download GNU Octave one of the best MATLAB alternatives by clicking the download button on this page.
Essentially, GNU Octave is a high-level programming language with a syntax similar to that used in MATLAB, the primary propose of Octave is to do numerical computations, in addition to that, the software comes with an IDE and a large set of ready-to-use functions to do image processing, video processing, audio processing, plotting, and many other functions.
The open-source nature of GNU Octave encourages others to share their codes and participate in enhancing the software, for that reason Octave enables users to add packages that extend the functionality and adds new features. It is possible to get new packages through GNU Octave's SourceForge page.