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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.
Aegis is great as well if you'd prefer something open source.
use https://github.com/Genymobile/scrcpy to take a screenshot of the "backup QR code"
afterwards you can use https://github.com/dim13/otpauth to convert the GAUTH code to plaintext
IMO, don't use Google Auth or Authy. Use Bitwarden.
NOTE:
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Hence, a higher number means a more popular project.