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draw.io - Online diagramming application
Anima App - Design, get feedback, convert to code, publish, iterate.
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.
Sketch Repo - Collection of resources for anyone who uses Sketch
PlantUML - PlantUML is an open-source tool that uses simple textual descriptions to draw UML diagrams.
Figma - Team-based interface design, Figma lets you collaborate on designs in real time.