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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.
Agree with other comment that portfolio projects are the best way to convince someone to hire you as a self-taught dev. If you don't know where to start, PY4E is a free online Python course with textbook and assignments that's offered by a prof at the U of Michigan.
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.