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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've been using one as an OpenPGP smartcard to encrypt my pass password database. Each password file can only be decrypted with the Yubikey, and the private key is kept in the tamper-resistant processor on the key. I have a PIN set on the key with lockout enabled - so if the key is stolen, an attacker only gets a few tries before the key locks itself out. It's effectively a fully local 2FA password management solution. I handle syncing the encrypted password store between devices using git.
There's a good setup guide here that goes through key generation and provisioning using a LiveUSB: https://github.com/drduh/YubiKey-Guide. If you follow that guide, the only two copies of your private key will be on your Yubikey (hardened, not supposed to be extractable) and on your backup flash drive.