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Platforma - Wireframe library of layouts and UI elements
draw.io - Online diagramming application
Contra Wireframe Kit - Open source wireframe kit for design and prototyping 🚀
LucidChart - LucidChart is the missing link in online productivity suites. LucidChart allows users to create, collaborate on, and publish attractive flowcharts and other diagrams from a web browser.
Source Wireframe Kit - Library of 537 blocks for desktop and mobile prototyping
PlantUML - PlantUML is an open-source tool that uses simple textual descriptions to draw UML diagrams.