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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 recommend you have a look through this list for inspiration : https://github.com/rby90/project-based-tutorials-in-c
This one is the equivalent for multiple languages. https://github.com/practical-tutorials/project-based-learning I'm sure you could adapt most of them to any language.
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.