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Tofu
Discontinued An easy-to-use two-factor authentication app for iOS [Moved to: https://github.com/calleluks/Tofu] (by calleerlandsson)
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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.
I personally use Raivo OTP for its export functionality but there's also Tofu (no export support last I checked). And if you use Bitwarden, their premium plan adds authenticator support.
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.