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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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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.
If you want to try a functional language that's closer to your existing background, consider trying ReScript.
I learned a lot by implementing a few projects with almost pure ramda: https://ramdajs.com/. I have a workshop I designed for learning how to use Ramda's core functions let me get a link for you..
I started a collection of resources on FP in general and specifically for JS over here: https://github.com/identinet/sanctuary-cheat-sheet