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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 have had great fun and good use of MySensors, that could be a place to start. It’s a very friendly and supportive community.
If you’re used to VS Code, I warmly recommend to have a look at PlatformIO but it’s probably best to start with the default Arduino IDE for a while to get used to the basics. PlatformIO is more versatile but also more difficult to use.
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.