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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.
Music iceberg charts seem to be all the rage right now, so after a bit of googling, I randomly stumbled on an old post about an iceberg chart generator for last.fm accounts. The original site isn't online anymore, however since the creator graciously made the source-code available under an open source license, I decided to update it and make it available permanently at https://explodingcamera.github.io/lastfm-iceberg/ (and the updated code on GitHub).