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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.
Anki is super flexible and can be configured using excel spreadsheets that you import. The issue with Anki is that it can be pretty daunting to configure and set up if you are not an IT person with some knowledge of HTML and databases.
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Hence, a higher number means a more popular project.