-
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.
It even have the FSRS Helper Anki Addon that will reschedule all your old cards at once. This will get you our of the Ease Hell (if you were) and will bring you some old have you have already forgotten (if you had some).
The only con (because of all of those prons) is that is is a bit complicated. Follow the guide. Feel free to let me know if you will have any questions.
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.