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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.
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vimium-c
A keyboard shortcut browser extension for keyboard-based navigation and tab operations with an advanced omnibar
Godbolt's compiler explorer has a vim emulation and it seems like it's this library: https://github.com/apmorton/monaco-vim
There’s firenvim that embeds neovim into the browser
Somewhat related: Vimium-C https://github.com/gdh1995/vimium-c
You can run a terminal in the browser which will have vim. Here's a example I implemented a few years ago: https://github.com/AGhost-7/nodejs-online