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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.
A (rare) good critique to systemd can be found here. Written by the developer behind s6, which happens to be scheduled to replace OpenRC on Alpine Linux. For completeness-sake, some of the main reasons why Alpine doesn't prefer systemd do not apply on most other distros.
Still, I applaud efforts like s6 and Dinit as competition is a good thing in general. I hope they'll continue to be improved upon until they've become viable alternatives to systemd for most users.
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.