Modern Fortran #SPLPAK. The 50 year old Fortran 66 code had languished in the #NCAR Command Language for decades. I've updated it to modern standards, made it thread safe, and removed the limitation of only working for up to 4 dimensions. Now you can least squares fit splines of any dimension. Ready for 50 more years of service. #Fortran

https://github.com/jacobwilliams/splpak