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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.
Secondly, https://www.hacker101.com is also a good resource. If you link your hacker1 account to hacker101 they will give you invites to private programs the further you progress in the learning modules. At least, they used to do that a couple years go.
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.