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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 have a lot of programming knowledge and are willing to RTFM it's not a bad way to dive in, provided you've got a guide like this one to help you get started. It's a super easy source of projects because if you have a discovery board of some sort, you've already got all these peripherals available. It would be trivial (and thus boring) to use them with your IDE's automagic HAL stuff and configuration, but using them from a manually-bootstrapped project (starting from square 1 with linker scripts and blank text file) it becomes a pretty interesting project all on its own, without even finding something practical to do with the device. Many hours of manual reading guaranteed.