The list of FIDO certified products alone is 39 pages long here: https://fidoalliance.org/certification/fido-certified-produc...
In addition to that, there are open source implementations for Java Card [1], open hardware efforts [2] and much more.
[1] https://github.com/darconeous/u2f-javacard
[2] https://github.com/google/OpenSK
The list of FIDO certified products alone is 39 pages long here: https://fidoalliance.org/certification/fido-certified-produc...
In addition to that, there are open source implementations for Java Card [1], open hardware efforts [2] and much more.
[1] https://github.com/darconeous/u2f-javacard
[2] https://github.com/google/OpenSK