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Iris
Discover, explore and manage your music library across multiple sources with this beautiful web-based interface. Iris is a Mopidy frontend extension. (by jaedb)
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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.
I recommend Iris with Snapcast/Snapserver, Mopidy, Funkwhale, Youtube etc. streaming to multiple synced devices. I had this set up for Christmas when the whole family met and everyone could play their music from anywhere and to anywhere by accessing a single web interface that distribues everything. For playing I run RaspiPi WH Zeros connected either via ethernet or Wifi. (I wrote a guide here)