What are some alternatives?
When comparing GnuPlot and Matplotlib, you can also consider the following products
GeoGebra - GeoGebra is free and multi-platform dynamic mathematics software for learning and teaching.
Origin - Origin is your new digital playground. It’s where you go to find the best that EA has to offer.
Plotly - Make charts and dashboards online from CSV or Excel data. Create interactive D3.js charts, reports, and dashboards online. API clients for R and Python.
SciDaVis - SciDAVis is a free application for Scientific Data Analysis and Visualization.
Wolfram Mathematica - Mathematica has characterized the cutting edge in specialized processing—and gave the chief calculation environment to a large number of pioneers, instructors, understudies, and others around the globe.