Kartesio is a program for calculating best fit curves with experimental points using regression algorithms or neural networks.
Kartesio has a simple interface that allows you to plot points and a curve. The curve is usually calculated automatically by the program, using the method you prefer, but you can also set it manually.
Latest source code: https://github.com/zorbaproject/kartesio
KDE’s source code: https://invent.kde.org/education/kartesio