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Wirify - 29 Sep 2017 . Wirify is available in two versions: Wirify is free and available on the homepage; Wirify Pro is available to customers with active Wirify credits. Wirify and Wirify Pro menu items - Wirify user guide.
draw.io - Online diagramming application
Platforma - Wireframe library of layouts and UI elements
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.
PlantUML - PlantUML is an open-source tool that uses simple textual descriptions to draw UML diagrams.