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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.
Generally big projects have detailed readme about contributing and where to start for new contributors. For example the dotnet runtime repo has a specific tag for issues open to external help. The `help wanted` tag is exactly described as "[up-for-grabs] Good issue for external contributors". Other "big" projects probably have something similar.
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.