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polaris
Shopify’s design system to help us work together to build a great experience for all of our merchants.
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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.
Polaris does have a CSS file - https://github.com/Shopify/polaris-react#using-the-css-compo...
You are free to use it as you want, it doesn't support the dynamic components obviously since it's CSS. But you can easily reimplement the parts you want.
Not sure if it does mobile payments natively. Depending on your content, Ghost [1] might be another option with a more palatable cost.
[1] https://ghost.org/
Sometimes libraries do a switcheroo where they run interpreted code on startup to locate the "real" implementation in a shared object, and then load that and replace themselves with it. I'm not sure this is really idomatic, but here's an example of what it looks like from OpenCV:
https://github.com/opencv/opencv/blob/master/modules/python/...
SKiDL (circuit design library) does this to a very large extent...
https://github.com/xesscorp/skidl