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n8n
Free and source-available fair-code licensed workflow automation tool. Easily automate tasks across different services.
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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.
Would Node-red work?
https://nodered.org/
(I like the look of n8n though)
Just fyi we (https://n8n.io/) are not OSI approved open-source, rather https://faircode.io/ licensed. Very similar but not the same (in short, you can use it for free, but you can not take the code and commercialize it).
Additionally also important to mention that both services currently do not have native nodes/integrations. So it still can be done easily via an HTTP Request node but you would have to check out their API documentation.