Kartesio is a program I wrote in 2011 for calculating best fit curves from a set of points. Kartesio uses QCustomPlot widget to plot data, and Maxima to solve expressions. The icons used in Kartesio have been designed by KDE Oxygen team. Kartesio also uses ZorbaNeuralNetwork to recognize the best fit curve. ZorbaNeuralNetwork is a library for easy neural networks construction I started writing in 2006, and supports training with both Widrow-Hoff algoritm and genetic algorithm.