Best Open-Source Visualization Tools in 2026

Visualization includes Open-source projects for charts, graphs, and visual exploration. Apache ECharts provides interactive browser charting; D3 builds dynamic visualizations with SVG, Canvas, and HTML; Apache Superset is a data exploration platform with many chart types. Use this category for dashboards, bundle analysis, and turning data into visuals.

The most popular open-source Visualization tool by GitHub stars is Stable-diffusion-webui(158.9k stars), followed by D3(112.7k stars)and Mermaid(87.3k stars). This page lists the top 30 of 33 visualization tools in the directory, ranked by community adoption.

Quick comparison

Best open-source Visualization tools in 2026, ranked by GitHub stars
#ToolStarsLanguageLicense
1Stable-diffusion-webui

A comprehensive web-based user interface for Stable Diffusion, providing powerful tools for generating and modifying images using AI models directly from your browser.

158.9kPythonGNU Affero General Public License v3.0
2D3

Bring data to life with SVG, Canvas, and HTML. D3.js helps you create dynamic, interactive data visualizations in web browsers using a powerful toolset with a rich ecosystem.

112.7kShellISC License
3Mermaid

A tool for generating diagrams such as flowcharts, sequence diagrams, and more from text, in a similar manner to markdown syntax. This tool is particularly useful for visualizing complex processes and information in an accessible and easy-to-understand format.

87.3kTypeScriptMIT License
4GitHub Readme Stats

Dynamically generated GitHub stats for your README files, enhancing engagement with visual graphs and data.

79.0kJavaScriptMIT License
5Grafana

The open and composable observability and data visualization platform. Visualize metrics, logs, and traces from multiple sources like Prometheus, Loki, Elasticsearch, InfluxDB, Postgres and many more.

73.2kTypeScriptGNU Affero General Public License v3.0
6Superset

Apache Superset is an open-source data visualization and data exploration platform, offering a wide range of visualization options and a user-friendly interface for interactive data exploration.

72.4kTypeScriptApache License 2.0
7ECharts

Apache ECharts is a powerful, interactive charting and data visualization library for the browser, providing a wide range of chart types and features for beautiful data representation.

66.1kTypeScriptApache License 2.0
8Metabase

Metabase is an easy-to-use open source Business Intelligence and Embedded Analytics tool that enables seamless interaction with data for everyone.

46.8kClojureOther
9JSONCrack.com

✨ An open-source visualization application that transforms various data formats, including JSON, YAML, XML, and CSV, into interactive graphs.

37.2kTypeScriptOther
10React-three-fiber

🇨🇭 A powerful React renderer for Three.js, enabling declarative 3D graphics using the React ecosystem.

30.5kTypeScriptMIT License

All 30 Visualization tools

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Frequently asked questions

What is the best open-source visualization tool in 2026?

Stable-diffusion-webui leads by GitHub stars(158.9k). A comprehensive web-based user interface for Stable Diffusion, providing powerful tools for generating and modifying images using AI models directly from your browser.

Are these visualization tools free?

Yes. Every tool on this list is open source and free to use in your own projects. Many can be self-hosted.

How is this list ranked?

Tools are ranked by GitHub star count, a strong proxy for community adoption and active maintenance. Star counts are refreshed regularly.

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