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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 think you might also like some puzzle-style challenges, try https://adventofcode.com There are 8 years with 25 daily problems, generally increasing in difficulty from day 1 to 25.
You might also get some inspiration from this: https://github.com/AlgoryL/Projects-from-Scratch
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.