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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.
do yourself a favor and look at the code: https://github.com/moodle/moodle/blob/master/notes/index.php (I will go and search which plugins are not checking for the "course-login" now...)
There is a (hillariously named) alternative noodle [1] that aims to compete in this space. It is under development but looks polished.
[1] https://noodle.run
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.