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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.
Depends and what are you interested in and if you prefer a particular programming language eg if you are good in say PHP I'd suggest helping the MantisBT project a bugtracker used by a lot projects. https://github.com/mantisbt. or say Python and enjoy genealogy I'd suggest going for Gramps https://github.com/gramps-project/gramps .
Maybe share more info on what you like so we suggest something you might enjoy?
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.