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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 transitioned to software from a Mechanical Engineering background.
Engineers often use models to answer electromechanical design questions about heat transfer and temperature. My tool at thermalmodel.com aims to fill the gap between back-of-the-envelope-calculations and complex, expensive tools like Ansys.
It's a tool I wish I had been capable of making for myself when I was doing MechE work, and I hope folks can make good use of it now.
The source code can be found at https://github.com/robinovitch61/hotstuff