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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.
I use Tigerbrew for this. It also supports 10.4 and 10.5. You'll also need a copy of XCode (I used version 2.5 on my Leopard install) to install pretty much anything.
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.