Looking for an open-source alternative to PlantUML? Below are 2 community-built tools that offer similar functionality — all free, open source, and ready to use or self-host. Ranked by GitHub stars.
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 picks from this list are Mermaid, Blueprint-mcp — all maintained, free to use, and self-hostable.
Yes. Every tool listed here is open source and free to use. Many can be self-hosted on your own infrastructure, which means no subscription fees and full control over your data.
Most of the alternatives listed are self-hostable. Check each tool's page for hosting details, system requirements, and licensing terms.
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