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UMLGraph - UMLGraph is a professional automated drawing tool that allows the designers the declarative specification and drawing of UML class and sequence diagram.
Figma Auto Layout - Design more, resize less
yEd - yEd is a free desktop application to quickly create, import, edit, and automatically arrange diagrams. It runs on Windows, Mac OS X, and Unix/Linux.
UX Flow Wireframe Prototyping System - Create beautiful user flows prototypes for your next project
Figma - Team-based interface design, Figma lets you collaborate on designs in real time.
draw.io - Online diagramming application