Umbrello UML Modeller is a free software UML diagram tool available natively for Unix-like platforms and Windows.
License: Open Source
Edraw Max is a versatile diagramming tool with a wide range of features and templates, making it suitable for various diagram types, while Umbrello is a focused, open-source UML modeling tool ideal for software design. Edraw Max is more user-friendly and feature-rich, whereas Umbrello is lightweight and free, catering specifically to UML diagramming needs.