You want
#RungeKutta methods in
#Fortran? I got you covered!
#rklib Do link previews work on Mastodon?:
https://github.com/jacobwilliams/rklib
GitHub - jacobwilliams/rklib: Fixed and variable-step Runge-Kutta solvers in Modern Fortran
Fixed and variable-step Runge-Kutta solvers in Modern Fortran - GitHub - jacobwilliams/rklib: Fixed and variable-step Runge-Kutta solvers in Modern Fortran
GitHub