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thorvg
Thor Vector Graphics is a lightweight portable library used for drawing vector-based scenes and animations including SVG and Lottie. It can be freely utilized across various software platforms and applications to visualize graphical contents.
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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.
What took the most time was to find a way to draw everything at runtime in C++. I tried a lot of libraries but finally I chose ThorVG which offers features similar to SVG.
I've made a little coat of arms generator for my game Vagabond. It's not as complex as Azgaar's one but I am pretty happy with the result.