The LabPlot Handbook
LabPlot is a program for two-dimensional function plotting and data analysis.

Introduction
LabPlot is a application for interactive graphing and analysis of scientific data. LabPlot provides an easy way to create, manage and edit plots.
Features:
Project-based management of data
Project-explorer for management and organization of created objects in different folders and sub-folders
Spreadsheet with basic functionality for manual data entry or for generation of uniform and non-uniform random numbers
Import of external ASCII-data into the project for further editing and visualization
Export of spreadsheet to an ASCII-file
Worksheet as the main parent object for plots, labels , supports different layouts and zooming functions
Export of worksheet to different formats (pdf, eps, png and svg)
Great variety of editing capabilities for properties of worksheet and its objects
Cartesian plots, created either from imported or manually created data sets or via mathematical equation
Definition of mathematical formulas is supported by syntax-highlighting and completion and by the list of thematicaly grouped mathematical and physical constants and functions
Investigation of plotted data is supported by many zooming and navigation features
Several analysis functions and methods for data reduction, differentiation, integration, interpolation, smoothing, (nonlinear) fitting, Fourier filter and Fourier transform
Linear and non-linear fits to data, several fit-models are predefined and custom models with arbitrary number of parameters can be provided
Supports many CAS backends like Maxima, Python, KAlgebra, Sage
Nice Worksheet view for evaluating expressions
Easy plugin based structure to add different Backends
Plugin based assistant dialogs for common tasks (like integrating a function or entering a matrix)
Datapicker for manual or (semi-)automatic data extraction from imported images containing plots and curves.
LabPlot can be found on its homepage at kde.org: https://labplot.kde.org/.