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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 would recommend Compiler Explorer , it allows you to execute and run everything online , it gives you a wide range of compilers and complex features but I would ignore all that and just focus on coding for now.
If you're using macOS, just install XCode and you'll get the Apple sanctioned clang. If you want to use gcc, you might look into homebrew or another system like it (e.g. Macports).
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.