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krypton-ios
Discontinued DEPRECATED Krypton turns your iOS device into a WebAuthn/U2F Authenticator: strong, unphishable 2FA.
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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 used this when it was still Krypton [0], it worked very well, it just gives you a "Want to log in?" notification on your phone, but for almost anything imaginable (inc SSH). I don't see it used much though.
[0] https://krypt.co/
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