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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.
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text-to-diagram-site
Compare syntax, layouts, outputs between languages for generating diagrams with text.
Individual diagrams have their grammar in a .jison file.
Flowchart: https://github.com/mermaid-js/mermaid/blob/develop/packages/...
A single grammar to support all the different use cases would be challenging. But we did have some plans to introduce guidelines to make different diagram syntaxes more consistent.
there's also D2 https://d2lang.com/tour/intro/ which is worth exploring.
if anyone wants to try out mermaid in their own .md knowledge base we've built a smooth editor experience in https://acreom.com (no account required).
I think Mermaid is better than PlantUML to write something quickly.
But D2 looks very promising. I like the simpler and more intuitive syntax.
https://text-to-diagram.com/
I actually have much more experience with plantuml (we actually have a plugin which generates diagrams for our jekyll/asciidoc docs site: https://github.com/FusionAuth/fusionauth-site/blob/master/si... ), but I have recently started using mermaid for a project and like it so far.