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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.
3) Advanced Browser. I like it because it adds a lot of new ways to sort cards (don't pay attention to Retention, Stability and Difficulty, those are from FSRS, it's custom data).
1) Review Heatmap. This add-on is very popular for tracking your progress, and chances are you've heard about it already considering how many people post their streaks.
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.