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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.
I was a big Rails, Ruby and dynamic typing fanboy. But then my project grew in size and I changed my beliefs.
I'd not start a big project in any language without: null-safety, proper sum-types, type inference.
Hence I like Kotlin, and KTor seems to be a good Sinatra/Flask like in that arena.
Another interesting development I find no-code/low-code tools for the backend, like Hasura. This allows me to "just expose Postgres over GraphQL" with very little code (mainly configuration). That combined with type-safe client library generation for a typesafe frontend language like Elm gives me all the power I need in a very different paradigm. Something worth considering.
Small example Hasura+Elm project: https://github.com/cies/low-code-backend-dockered