Our great sponsors
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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.
Check the examples in the TypeScript Playground: https://www.typescriptlang.org/play or https://github.com/type-challenges/type-challenges
https://www.codewars.com/ - for pretty much most of languages that are popular. Community driven, organized more or less, with catalogued algorithmic riddles/tasks of different difficulty
NOTE:
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.