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monkeytype
The most customizable typing website with a minimalistic design and a ton of features. Test yourself in various modes, track your progress and improve your speed.
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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.
App Link: https://cybertype.app it is completely free and Open Source: https://github.com/MananTank/cybertype What are your thoughts on themes and functionality?
If you are looking for JSON data for Korean, check out : https://github.com/monkeytypegame/monkeytype/tree/master/frontend/static/languages