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Some top alternatives to diagrams.net includes Miro, FigJam, SmartDraw, Gliffy, Microsoft Visio, DrakonHub, Creately, Lucidchart, EDraw Max, DrawSQL, Quick Diagram and HackerDraw.
Some top alternatives to Custellence includes Miro, FigJam, UXPressia, SmartDraw, Gliffy, DrakonHub, 10SCAPE, FlowMapp, Quick Diagram, diagrams.net, CardBoard and The Experience Manager.