ArgoUML

ArgoUML is a free, open-source software tool used by developers and designers to create visual diagrams called UML (Unified Modeling Language) models. These diagrams help plan and illustrate how a software system's parts interact, including the structure, behavior, and data flow. By using ArgoUML, teams can visualize complex systems, facilitate communication, and ensure better design before coding begins. It supports various diagram types and is platform-independent, making it a versatile choice for software design and documentation across different environments.