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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.
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shoelace-css
A collection of professionally designed, every day UI components built on Web standards. SHOELACE IS BECOMING WEB AWESOME 👇👇👇
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crayons
🖍️ Crayons - A UI Kit comprising of web components for building Freshworks Apps! (by freshworks)
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Grafana
The open and composable observability and data visualization platform. Visualize metrics, logs, and traces from multiple sources like Prometheus, Loki, Elasticsearch, InfluxDB, Postgres and many more.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
I'd never heard of it so I did some quick googling.
From https://github.com/JetBrains/ring-ui:
> This collection of UI components aims to provide all the necessary building blocks for web-based products built inside JetBrains, as well as third-party plugins developed for JetBrains' products.
From https://blog.jetbrains.com/blog/2018/09/25/ring-ui-1-0-is-re...:
> At JetBrains, we use Ring UI components for our web-based products like YouTrack, Hub, TeamCity, and Upsource.
It's not bad, but I have grown really fond of Grafana's date/time picker and can whip up a clone of that using bootstrap and React Datepicker (https://reactdatepicker.com) in about ten minutes :)
The main reason you would want to pick such a proprietary library is to achieve a homogeneous look and feel (often behavioral UX as well) when your app must work within another product - this product/organization is usually the one that also provides the library in question, and more often than not, uses the same design system if not the library itself.
We built https://github.com/freshworks/crayons for the same reason - apps published to the Freshworks Marketplace can be built using Crayons. We also ended up building our own user facing SaaS applications using Crayons.
Adobe has http://topcoat.io too. How many companies have multiple component libraries/frameworks? Seems like a lot of wasted time and resources.