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Whimsical Wireframes - Lightning fast wireframing with real-time collaboration.
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.
Wireframe.cc - Sweet and simple online wireframing tool.
draw.io - Online diagramming application
Wireframe for Figma - Lightning fast wireframing on figma (500+ elements)
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.