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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.
Osprette (in pink) also seems to be really popular (if you don’t mind the lack of keys)
I haven’t gotten around to trying anything from fingerpunch yet (I think their faux fox series is probably their most popular) but I don’t imagine any of their cases meant for trackballs is all that hard to work with (and if you just want a trackball, Ploopy seems to be the go to)
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.