Diagramiq is an online app for creating Flowcharts, UML, BPMN, Network Diagrams, Decision Trees and more. It's blazing fast, intuitive and it has a wide-range of predefined shapes to get you started.
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DiagramDeck Alternatives
DiagramDeck is described as 'Cloud-based diagramming tool hosting draw.io files, enabling real-time collaboration in a shared workspace for creating flowcharts, UML, cloud architecture, and network diagrams' and is a Diagram Editor in the development category. There are more than 10 alternatives to DiagramDeck, not only websites but also apps for a variety of platforms, including Mac, Windows, Linux and Android apps. The best DiagramDeck alternative is draw.io, which is both free and Open Source. Other great sites and apps similar to DiagramDeck are yEd Graph Editor, Lucidchart, PlantUML and Microsoft Visio.