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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I disagree, if it comes to CSS refference that's more readable https://cssreference.io/ Also their site is outdated by years sane as their "bootstrap alternative"
www.w3fools.com shows you why you shouldn't trust w3schools, at least in the past.
NOTE:
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Hence, a higher number means a more popular project.