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nitrokey-fido2-firmware
FIDO2 USB token optimized for security, extensibility, and style. A fork of Solo key.
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InfluxDB
Purpose built for real-time analytics at any scale. InfluxDB Platform is powered by columnar analytics, optimized for cost-efficient storage, and built with open data standards.
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I have a Yubikey 5 on my keychain that I mainly use as an OpenPGP smart card to encrypt my password database (I use pass). It works very well for my use case, no complaints.
NOTE:
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Hence, a higher number means a more popular project.