The best Mind Mapping alternative to Mermaid is yEd Graph Editor, which is free. If that doesn't suit you, our users have ranked more than 25 alternatives to Mermaid and three of them are Mind Mapping Tools so hopefully you can find a suitable replacement. Other interesting Mind Mapping Tool alternatives to Mermaid are PlantUML and Kroki.
yEd is a powerful diagram editor that can be used to quickly create diagrams manually or import external data for analysis and auto-magically arrange even large data sets by just pressing a button. You can use yEd to quickly create flow charts, BPMN and UML diagrams...
PlantUML is an open-source tool that uses simple textual descriptions to draw UML diagrams. The generator can be run anywhere within JVM and integrated with various application such as wiki, text editor, IDE, programming language, documentation generator, and others.
Creates diagrams from textual descriptions! It provides a unified API with support for BlockDiag, BPMN, Bytefield, C4 (with PlantUML), Ditaa, Erd, GraphViz, Mermaid, Nomnoml, PlantUML, SvgBob, UMLet, Vega, Vega-Lite, WaveDrom.
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Both can be integrated into markdown files.