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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 haven’t used it but https://appwrite.io/ is another open source alternative that I think has lambdas
Just wanted to mention that I stumbled upon another option recently: Supabase. It's basically Firebase, but open source if you care about that. The other thing that makes it different is it uses Postgres, so if you're a fan of relational DBs (Firebase uses Cloud Firestore, a NoSQL/non-relational DB), it's an option worth considering. If you don't care though, Firebase is much more mature & has a lot more functionality than Supabase.