Is this not open source enough for your purposes? https://github.com/mermaid-js/mermaid https://github.com/mermaid-js/mermaid https://github.com/mermaid-js/mer

Is this not open source enough for your purposes? https://github.com/mermaid-js/mermaid https://github.com/mermaid-js/mermaid https://github.com/mermaid-js/mermaid-live-editor https://github.com/mermaid-js/mermaid-live-editor https://github.com/mermaid-js/mermaid-cli https://github.com/mermaid-js/mermaid-cli OP's product is not open source btw