JKQTPlotter
an extensive Qt4/Qt5 Plotter framework (including a fast variant and a LaTeX equation renderer!), written fully in C/C++ and without external dependencies
Collaboration diagram for Statistical Graphs (e.g. Boxplots ...):
Screenshot Classes
JKQTPBoxplotVerticalGraph, JKQTPBoxplotHorizontalGraph
JKQTPViolinplotVerticalElement, JKQTPViolinplotHorizontalElement
See also
Statistics To Plot Adaptors for shortcuts to calculate statistical properties of data and then adding a plot with the results.