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reactjs.org
Discontinued The React documentation website [Moved to: https://github.com/reactjs/react.dev]
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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.
A whole VS Code competitor is a lot of work, but I’ve been working on Typescript/JavaScript extensions for CodeMirror. My PR here has the latest: https://github.com/reactjs/reactjs.org/pull/4720
Obsidian developers here! (https://obsidian.md/)
The new editor in Obsidian was made possible by CodeMirror 6, and it has been powering both the Live Preview mode (like Typora) and the source mode in Obsidian ever since.
It can be a bit overwhelming to get into first, but as we experimented more with it, we found it to be extremely extensible and powerful. It's also highly performant for large documents. Another major reason we chose CM 6 is that it's also one of the only code editors that work decently on mobile.
While developing the new editor, Marijn was also amazingly responsive in investigating and fixing all the big and little things we ran into, even relatively niche issues like IME input bugs.
If you find CM 6 useful, consider what you can to support the project! Funding link is here: https://marijnhaverbeke.nl/fund/