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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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mermaid
Generation of diagrams like flowcharts or sequence diagrams from text in a similar manner as markdown
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Fun! I think there's a ton of value in programmatic "markup for flowchart" type tools. My tool of choice has historically been MermaidJS: https://mermaid-js.github.io/mermaid-live-editor
For sequence diagrams in text format you can take diagwiz for a spin. There is also an online version of the tool. Disclaimer: It is working, but it's still just an experiment and might change a lot.
https://github.com/kjagiello/diagwiz
https://diagwiz.io/playground/
My incomplete attempt to do something similar in python https://github.com/ragsagar/yezdi
Here's one I didn't see on your list:
https://wavedrom.com/
Why not use Mermaid (JS => SVG) or PlantUML (Java => SVG, PNG, etc)?
Especially Mermaid [1] is supported by a lot of Markdown editors and can be directly rendered in browsers by including the javascript library. Without any data protection issues.
PlantUML needs a server or an installation (Java) which can be self hosted as well. And provides a ton of integrations [2]. And of course it supports sequence diagrams [3]
[1] https://mermaid-js.github.io/mermaid/#/sequenceDiagram