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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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tillitis-key1
Board designs, FPGA verilog, firmware for TKey, the flexible and open USB security key 🔑
I'm not sure if they are publicly available yet by tillitis may be what you're looking for.
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.