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 an open-source tool that focuses on text-based UML diagramming, making it ideal for developers and technical users. In contrast, Microsoft Office Visio offers a user-friendly interface and a wide range of templates, making it suitable for business professionals looking for detailed and visually appealing diagrams.