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mermaid
Generation of diagrams like flowcharts or sequence diagrams from text in a similar manner as markdown
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SurveyJS
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.
D2 is a modern declarative language for designing diagrams with text. It supports a variety of different diagram types as well as traditional UML sequence diagrams. D2 is free and open-source under the Mozilla Public License 2.0 license.
Mermaid is a Javascript-based diagramming tool for rendering many diagram types from Markdown-inspired text definitions and supports sequence diagrams. Mermaid is free and open-source under the MIT license.