D3
Observable, Inc. · Data visualization
Modular JavaScript library for bespoke, data-driven web graphics: scales, axes, shapes, layouts, geo projections, transitions and DOM selections
ISCOpen sourceFreeLocalNov 2, 2026
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Matplotlib
Matplotlib Development Team (NumFOCUS) · Data visualization
The foundational Python plotting library for static, publication-quality figures with full control over every element, exported to PDF, SVG, PNG and PGF
Open sourceOpen sourceFreeLocalNov 2, 2026
Plotly
Plotly Technologies Inc. · Data visualization
MIT-licensed interactive charting libraries for Python (plotly.py), JavaScript (plotly.js) and R, plus the Dash framework for analytical web apps
MITOpen sourceFreeLocalNov 2, 2026
Vega-Altair
Vega-Altair developers (Vega project) · Data visualization
Declarative Python visualization library that compiles concise chart specifications to Vega-Lite JSON for interactive, grammar-of-graphics plots
BSD-3-ClauseOpen sourceFreeLocalNov 2, 2026
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