Diagram Designer is a vector graphics editor that allows you to create UML class diagrams, illustrations, flowcharts and slide shows. Developed by Meesoft
License: Free
Diagram Designer is a lightweight and user-friendly tool suitable for basic diagramming tasks, while Umbrello offers extensive UML support and advanced modeling capabilities ideal for complex software design. The choice between the two depends on the user's specific needs, whether they prioritize ease of use or advanced features.