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anki-search-inside-add-card
Discontinued An add-on providing full-text-search and PDF reading functionality to Anki's Add card dialog
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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.
But, for the actual studying, I use the addon that gives Anki a PDF reader. That way, I can put in my study material and create cards while on the same page in the same program. It tracks progress and does a whole lot more.
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.