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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.
hmm, Authenticator is open source (https://github.com/mattrubin/Authenticator). 2FA is also available in open source key manager program such as KeePass.
When it comes to 2FA, I would rather trust open source apps vs the ones made by Google/MS.
NOTE:
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Hence, a higher number means a more popular project.