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Wireflow - Create beautiful flowcharts
Sankey Diagram (csaladen) - Sankey Diagram Generator
Mind Map by RealtimeBoard - More than your average mind map
SankeyDiagram.net - SankeyDiagram.net is an easy-to-use tool for generating and designing Sankey Diagrams which visualize flows and especially budgets. The entered data stays in your browser and gets processed locally so you don't have to worry about privacy.
Platforma Flowcharts - Collection of cards for website and app prototyping
SankeyMATIC - There are no tools to install. There is no code to write. You do not have to sign up for anything. Just enter your data, customize the diagram to your liking, and download a finished product.