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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.
The individual C/C++ files in the firmware core are LGPL while the IDE itself is under AGPL.
The compiler toolchain is GCC (GPLv3 with an exception for use of the binary-form standard library in non-free code) and avr-libc (BSD). It also includes avrdude (GPLv2)
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The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.