PlantUML is an open-source tool allowing users to create UML diagrams from a plain text language. Developed by Arnaud Roques
License: Open Source
PlantUML is a lightweight, text-based tool ideal for quick and flexible diagram creation, while ArgoUML offers a user-friendly graphical interface with robust UML support but may lack flexibility in integration. PlantUML excels in environments where version control and scripting are essential, while ArgoUML is better suited for users who prefer a visual design approach.