Julia is described as 'high-level, high-performance dynamic programming language for technical computing, with syntax that is familiar to users of other technical computing environments' and is a popular app in the Development category. There are more than 25 alternatives to Julia for a variety of platforms, including Windows, Linux, Mac, BSD and Android. The best alternative is Python, which is both free and Open Source. Other great apps like Julia are Java (Free Personal, Open Source), C++ (Free, Open Source), Rust (Free, Open Source) and GNU Octave (Free, Open Source).
C++ is a statically typed, free-form, multi-paradigm, compiled, general-purpose, powerful programming language. It is regarded as an intermediate-level language, as it comprises a combination of both high-level and low-level language features.
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.