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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.
Package versions should follow SemVer. Example number is 1.2.3 (major.minor.patch). You should increase major number when introducing breaking changes (anything that could break apps using your package). Minor number should be used when adding new features without breaking existing functionality. Patch number is used for small bugfixes that do not break logic nor add new features.
Free one and providing very similar experience: https://code.visualstudio.com/
There are many other IDE's available (ex. https://atom.io/ which is written using node, javascript and npm).