There are 2 open-source alternatives to PlantUML in this directory. The most popular is Mermaid with 87.3k GitHub stars, followed by Blueprint-mcp(473 stars). All are open source, free to use, and many can be self-hosted.
| # | Tool | Stars | Language | License |
|---|---|---|---|---|
| 1 | Mermaid 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. | 87.3k | TypeScript | MIT License |
| 2 | Blueprint-mcp blueprint-mcp is a tool for generating diagrams to visualize and understand codebases and system architecture, leveraging Nano Banana Pro technology for insightful architectural diagrams. | 473 | Python | — |
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.
blueprint-mcp is a tool for generating diagrams to visualize and understand codebases and system architecture, leveraging Nano Banana Pro technology for insightful architectural diagrams.
The top three are Mermaid(87.3k stars), Blueprint-mcp(473 stars). All are open source and free to use.
Yes. Every tool listed here is open source and free to use in your own projects. Many can be self-hosted on your own infrastructure, which means no subscription fees and full control over your data.
Many of the alternatives listed are self-hostable. Each tool's page lists hosting details, system requirements, and licensing terms.
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