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WebNowPlaying-BrowserExtension
Discontinued The extension to go along with the WebNowPlaying plugin for Rainmeter
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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.
With spotify specifically, you need to know that using spotify the app and spotify the online service are different things to rainmeter. For the app, a skin needs to use the now playing measure, of which spotify is one of the partially supported players you can use. For the online service, a skin needs to use the webnowplaying plugin and you need to install a browser extension. On top of all that, you may also need to install spicetify-cli (for help with that, please visit their community); however, it appears the latest spotify update has broken things in regards to it.