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OpenSK
OpenSK is an open-source implementation for security keys written in Rust that supports both FIDO U2F and FIDO2 standards.
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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.
Google has a Rust / Tock OS code that runs on a Nordic USB dongle : https://github.com/google/OpenSK
makerdiary also has fido2 code that runs on a Nordic USB dongle : https://github.com/makerdiary/nrf52-u2f
https://solokeys.com makes Fido2 keys
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.