StarUML

StarUML is a cross‑platform modeling tool that supports a wide range of diagram types within a single project. It includes most UML 2 diagrams—such as class, component, sequence, statechart, and activity—as well as Entity‑Relationship, Data Flow, Flowchart, Mindmap, C4, SysML, BPMN, UI Wireframe, and cloud architecture diagrams for AWS, GCP, and Azure. The interface is designed for quick creation and editing, allowing users to generate diagrams from Mermaid syntax and to design wireframes with a dedicated Frame0 feature.

The application targets developers, system engineers, and business analysts who need to visualize software designs, database structures, processes, or system architectures without using multiple specialized tools. Its extensibility is provided through JavaScript plugins, enabling custom extensions, and it offers AI integration via an MCP server for assistance during modeling.

StarUML emphasizes a straightforward, agile workflow, aiming to reduce the complexity and cost associated with traditional modeling suites while still delivering the breadth of diagramming capabilities required for modern software and systems engineering.