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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.
seing that the question of a note-taking apps is foreever on the table, I'd like to present to you [Journal Startpage](https://github.com/sapristi/journal-startpage/) - a browser extension (only Firefox for now - chrome publication in progress) that transforms your browser new-tab into a full note-taking app. The focus was to have something that allows to quickly take notes, and doesn't get in your way - with customizable theming.
To make a docker image you could just fetch those files, put them in a container with nginx and have a container for this.