Sankey Diagram (csaladen) - Sankey Diagram Generator
Now UI Kit - A beautiful Bootstrap 4 UI kit. Yours free.
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.
Bots UI Kit - Fully customizable Sketch UI Kit for Messenger Platform
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.
Landing UI Kit - Handcrafted UI components for landing pages