Alternative to Whimsical?

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draw.io

130 38,625 8.5 JavaScript

draw.io is a JavaScript, client-side editor for general diagramming.

Draw.io itself is self hostable by the looks of it https://github.com/jgraph/drawio

plantuml

123 9,562 9.5 Java

Generate diagrams from textual description

Plant UML is an option depending on how complex the diagrams you want are: https://plantuml.com

SurveyJS

surveyjs.io sponsored

Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.

NOTE: The number of mentions on this list indicates mentions on common posts plus user suggested alternatives. Hence, a higher number means a more popular project.

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