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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.
That being said... I've never seen anything on their site that makes them stand above anyone else and there's always been better options (IE: MSDN or other options listed by others like http://devdocs.io/).
CSS 3 is basically CSS 2.1, but with certain parts replaced and other parts added on top, so you kinda have to learn CSS 2.1 + whatever 3 replaces/adds. Annoying, but now my CSS selectors make sense (IMO).
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.