For fun, I wrote a CHIP8 interpreter in Fortran recently [1].<p>Fortran is still heavily used in computational chemistry, computational fluid dynamics, marine engineering, nuclear engineering, reservoir engineering, and numerous other engineering fields. Volcanologists use it to predict ash dispersal [2]. Biomedical companies use it for cardiac electrophysiology. Econometrists use it to do tax research [4]. Plasma physicists use it to design magnetic confinement fusion devices [5]. Astrophysicists use it for relativistic magnetohydrodynamics [6]. NASA uses it for all kinds of fluid dynamics-related purposes [7] (read jet engines and rockets), and so do they at CERFACS [8]. For all I know, some integrated circuit manufacturers probably use it use it [9]. It's also used in ham radio and probably some military agencies [10]. It's used in vehicle crash testing [11]. It's used in combustion simulation software [12], fire dynamics [13], hydrometallurgy (ore leaching) [14]. US Geological Survey uses it for ground-water flow modelling [15]. We could go on and on.<p>[1] <a href="https://news.ycombinator.com/item?id=38920486">https://news.ycombinator.com/item?id=38920486</a>
[2] <a href="https://doi.org/10.1016/j.cageo.2008.08.008" rel="nofollow">https://doi.org/10.1016/j.cageo.2008.08.008</a>
[3] <a href="https://www.elem.bio/index.html" rel="nofollow">https://www.elem.bio/index.html</a>
[4] <a href="https://taxsim.nber.org/" rel="nofollow">https://taxsim.nber.org/</a>
[5] <a href="https://doi.org/10.1016/j.cpc.2021.107986" rel="nofollow">https://doi.org/10.1016/j.cpc.2021.107986</a>
[6] <a href="https://doi.org/10.3390/fluids9010016" rel="nofollow">https://doi.org/10.3390/fluids9010016</a>
[7] <a href="https://fun3d.larc.nasa.gov/" rel="nofollow">https://fun3d.larc.nasa.gov/</a>
[8] <a href="https://www.cerfacs.fr/avbp7x/" rel="nofollow">https://www.cerfacs.fr/avbp7x/</a>
[9] <a href="https://en.wikipedia.org/wiki/SPICE" rel="nofollow">https://en.wikipedia.org/wiki/SPICE</a>
[10] <a href="https://en.wikipedia.org/wiki/Numerical_Electromagnetics_Code" rel="nofollow">https://en.wikipedia.org/wiki/Numerical_Electromagnetics_Cod...</a>
[11] <a href="https://www.openradioss.org/" rel="nofollow">https://www.openradioss.org/</a>
[12] <a href="https://en.wikipedia.org/wiki/CHEMKIN" rel="nofollow">https://en.wikipedia.org/wiki/CHEMKIN</a>
[13] <a href="https://en.wikipedia.org/wiki/Fire_Dynamics_Simulator" rel="nofollow">https://en.wikipedia.org/wiki/Fire_Dynamics_Simulator</a>
[14] <a href="https://youtu.be/-dvG270QttE?si=AO-ky0fGwkIEmXDx" rel="nofollow">https://youtu.be/-dvG270QttE?si=AO-ky0fGwkIEmXDx</a>
[15] <a href="https://www.usgs.gov/mission-areas/water-resources/science/modflow-and-related-programs" rel="nofollow">https://www.usgs.gov/mission-areas/water-resources/science/m...</a>