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davical
Docker container with a complete DAViCal server (davical + apache + postgresql) with (optional) HTTPS support.
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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.
All this to say, with a bit of google-foo, I found DaviCAL (which has been suggested in this sub in the past), which has an active docker (that, I did not vet out, btw...) hosted here
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.