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LME
Logging Made Easy (LME) is a no-cost and open logging and protective monitoring solution serving all organizations. (by cisagov)
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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.
Not sure if you're aware, but CISA recently updated the Logging Made Easy solution https://www.cisa.gov/resources-tools/services/logging-made-easy
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.