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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.
If you want the latest C# support, then one of the officially supported editors by OmniSharp will do. If you think VS Code is too heavy, then use Emacs or Vim. Or you can just write on any text editor and run it from Terminal. The C# extension is still supported by the way
There is RoslynPad but you have to build yourself on Mac OS.
If you do find VSCode a bit too heavyweight, you might be interested in the dotnet-script package. It has a little bit of new syntax to learn, but might float your boat.
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.