Open source diagram drawing tools

These tools are all open-source and offer a range of features and functionalities to suit different needs and preferences.

Kroki: A free, open-source tool that supports a wide range of diagram types, including sequence diagrams, system architecture diagrams, ER diagrams, and Gantt charts. It is known for its ease of use and modern visual appearance.


Mermaid: A free, open-source tool that uses Markdown-like syntax to create diagrams. It supports various types of diagrams, including flowcharts, sequence diagrams, and Gantt charts. It is known for its ease of use and modern visual appearance.


Excalidraw: A free, open-source tool that allows users to create hand-drawn diagrams. It is known for its flexibility and ease of use, making it suitable for both beginners and experienced users.


Draw.io: A free, open-source tool that supports a wide range of diagram types, including workflow diagrams, BPM diagrams, org charts, UML diagrams, ER diagrams, and network diagrams. It is known for its robust features and modern visual appearance.

Azimutt: A free, open-source tool that is specifically designed for creating ER diagrams. It is known for its ease of use and modern visual appearance.


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